Overload Relays & Thermal Unit Selection

Overload Relays and
Thermal Unit Selection
Class 9065
CONTENTS
Description Page
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-14
Approximate Dimensions and Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-17
Thermal Unit Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-42

Product Description
2
INTRODUCTION
Overload relays are intended to protect motors, controllers, and branch-circuit conductors against
excessive heating due to prolonged motor overcurrents up to and including locked rotor currents.
Protection of the motor and the other branch-circuit components from higher currents, due to short
circuits or grounds, is a function of the branch-circuit fuses, circuit breakers, or motor short-circuit
protectors.
Electrical motors make up a large percentage of power system loads. Market demands for reduced
downtime and increased productivity have compelled the motor control industry to evaluate motor
protection technology continuously. Technology advancements now allow the motor control industry to
offer several options for motor protection.
This briefly reviews traditional motor protection technologies and discusses the new, electronic motor
protection options. After reading this paper, you should be able to understand the available technologies
and how to choose the right solution for a given application. Important factors to consider in determining
the appropriate overload protection include:
• Application requirements
• Cost per feature of a given technology
• Willingness and ability of all parts of the user’s organization to embrace and implement the new
technology.
MOTOR FAILURE AND PROTECTION
Motor failure may be the result of electrical or mechanical factors. A study commissioned by the
Electrical Research Associates (ERA) of the United Kingdom in 1986 indicated the most common
causes of motor failure are:
1. Overcurrent 30%
2. Contamination 18%
3. Single Phasing 15%
4. Bearing Failure 12%
5. Aging (natural wear) 10%
6. Rotor Fault 5%
7. Miscellaneous 7%
Failure modes 1, 3 and 7 are attributable to electrical issues. Modes 2, 4, 5 and 6 are the result of
mechanical (and some manufacturing) issues.
Historically, motor protection provided with the controller was only able to address the electrical causes
of motor failure. These electrical issues account for at least 45% of the most common causes of motor
failure. Motor branch circuits are protected against short circuits (instantaneous overload currents) and
steady state or low level, sustained overload relays. In the U.S., this protection is provided by the short
circuit protective device (SCPD) and the motor overload relay, when they are applied according to the
National Electrical Code (NEC).
Trip Class Designation
Regardless of the product style (NEMA or IEC), overload relays respond to overload relay conditions
according to trip curves. These trip curves are defined by the class of protection required (see Table 1).
Table 1: Trip Classes
Class Designationq Tripping Time
Class 10 10 Seconds or less
Class 20 20 Seconds or less
Class 30 30 Seconds or less
q Marking designation for tripping time at 600% of current element rating
© 1998 Square D All Rights Reserved
5/98

5/98
IEC components are typically application rated. This means the controller is sized very close to its
operational limit for a given application. IEC motors are also generally more application rated. For these
reasons, Class 10 trip is most common on IEC applications. Because NEMA products are applied with
more built-in excess capacity, the Class 20 trip is most common.
Figure 1 shows the three types of trip curves.
Trip Times (s)
10000.0
1000.0
100.0
10.0
Protection to Motor Branch Circuits
To protect the motor branch circuit against short circuits, overload relay protection must be coordinated
with protection provided by the SCPD. The SCPD may be a fused switch or a circuit breaker. Figure 2
shows the critical point (I c) in this coordination.
© 1998 Square D All Rights Reserved
Class 10
Class 20
Class 30
1.0
1.0 Multiples of FLA
10.0
Figure 1 Typical Trip Curves
10000.0
100-125% NEMA
105-120% IEC
Trip Time (s)
1000.0
100.0
Run Current
10.0
Motor Current
Overload Relay
Motor Damage
SCPD
1.0
1.0 10.0
Multiples of FLA
Figure 2 Typical Coordination Curves
Product Description
Ic
Starting
Current
3

Product Description
Drawing shows operation of melting alloy overload relay. As heat melts alloy,
ratchet wheel is free to turn. The spring then pushes contacts open.
4
One Piece Thermal Unit
Melting Alloy Thermal Unit
Thermal Relay Unit
Motor
Magnet Coil
Solder pot (heat sensitive element)
is an integral part of the thermal unit.
It provides accurate response to overload
current, yet prevents nuisance tripping.
Heating winding (heat producing element)
is permanently joined to the solder pot, so
proper heat transfer is always insured.
No chance of misalignment in the field.
At current values greater than Ic, the SCPD reacts quicker than the overload
relay. At current values less than Ic,
the overload relay reacts quicker. Articles
110 and 430 of the NEC provide guidance in the selection of the SCPD to
facilitate coordination of the components of a motor branch circuit (i.e.
location of point Ic).
Withstand Ratings
Equipment withstand ratings are linked to branch circuit protection. The
same parameters that affect the trip point of a given protective device also
contribute to how much (or how little) let-through energy the device may be
exposed to and still function after the clearing of the fault. Withstand does not
explicitly show up in Figures 1 or 2. Traditional melting alloy and bi-metal
overload relays have been the “weak link” in motor branch circuit withstand
ratings. Since these devices employ sensing elements directly in the current
path, electrical faults leading to mechanical stresses are a concern. These
devices typically contain small mechanical parts than can quickly become
out-of-spec when exposed to let-through energy exceeding their withstand
capability. If the coordinated protection for the circuit operates properly (and
the SCPD protects the circuit), the motor and the controller will be protected.
The withstand rating of a branch circuit must account for the withstandability
of the lowest rated component in the circuit.
Thermal Overload Relay
In spite of being relatively simple and inexpensive, thermal overload relays
are very effective in providing motor running overcurrent protection. This is
possible because the most vulnerable part of most motors is the winding
insulation and this insulation is very susceptible to damage by excessively
high temperature.
Being a thermal model of a motor, the thermal overload relay will produce a
shorter trip time at a higher current similar to the way a motor will reach its
temperature limit in a shorter time at a higher current. Similarly, in a high
ambient temperature, a thermal overload relay will trip at a lower current or
vice versa allowing the motor to be used to its maximum capacity in its
particular ambient temperature (if the motor and overload are in the same
ambient).
Once tripped, the thermal overload relay will not reset until it has cooled,
automatically allowing the motor to cool before it can be re-started.
NOTE: The overload relay must be used in conjunction with a contactor. The
overload relay has no power contacts and cannot disconnect the motor by
itself. The control circuit contact must be wired in series with the coil of the
contactor so that the contactor will de-energize when an overload occurs.
Square D manufactures three types of overload relays, the melting alloy, the
bimetallic, and solid state. In some types, the bimetallic is available in both
non-compensated and ambient temperature-compensated versions. In both
melting alloy and bimetallic, single element and three element overloads are
available. Solid state overloads are discussed on Page 5.
Melting Alloy
In melting alloy thermal overload relays, the motor current passes through a
small heater winding. Under overload conditions, the heat causes a special
solder to melt allowing a ratchet wheel to spin free thus opening the control
circuit contacts. When this occurs, the relay is said to “trip”. To obtain
appropriate tripping current for motors of different sizes, or different full load
currents, a range of thermal units (heaters) is available. The heater coil and
© 1998 Square D All Rights Reserved
5/98

Contact
Bimetallic Overload Relay with Side
Cover Removed
Percent Full Load Current
600
500
400
300
200
100
5/98
Motor Damage Area
Motor Heating Curve
Time Required To Trip
Heater Coil
85%-115%
Trip Adjustment
Bimetal
Strip
0 1 2 3 4 5 6
Minutes
7 8 9 10 11 12
Graph shows motor heating curve and overload relay trip curve.
Overload relay will always trip at a safe value.
Overload Relay Trip Curve
© 1998 Square D All Rights Reserved
Product Description
solder pot are combined in a one piece, nontamperable unit. Melting alloy
thermal overload relays must be reset by a deliberate hand operation after
they trip. A reset button is usually mounted on the cover of enclosed starters.
Thermal units are rated in amperes and are selected on the basis of motor
full load current, not horsepower.
Non-Compensated Bimetallic
Bimetallic thermal overload relays employ a U-shape bimetal strip
associated with a current carrying heater coil.When an overload occurs, the
heat will cause the bi-metal to deflect and operate a control circuit contact.
Different heaters give different trip points. In addition, most relays are
adjustable over a range of 85% to 115% of the nominal heater rating.
Bimetallic overload relays are used where the controller is remote or difficult
to reach. Three wire control is recommended when automatic restarting of a
motor could be hazardous to personnel.
Automatic Reset
These relays are field convertible from hand reset to automatic reset and
vice-versa. On automatic reset after tripping the relay, contacts will
automatically reclose when the relay has cooled down. This is an advantage
when the relays are inaccessible. However, automatic reset overload relays
should not normally be used with 2-wire control. With this arrangement, the
motor will restart when the overload relay contacts reclose after an overload
relay trip, and unless the cause of the overload has been removed, the
overload relay will trip again. This cycle will repeat and eventually the motor
will burn out due to the accumulated heat from the repeated inrush and
overload current. More important is the possibility of danger to personnel.
The unexpected restarting of a machine may find the operator or
maintenance man in a hazardous situation as he attempts to find out why his
machine has stopped.
Ambient Temperature Compensated Bimetallic
Ambient-compensated bimetallic overload relays are designed for one
particular situation; that is, when the motor is at a constant ambient
temperature and the controller is located separately in a varying ambient
temperature. In this case, if a standard thermal overload relay were used, it
would not trip at the same level of motor current if the controller temperature
changed. The standard thermal overload relay is always affected by the
surrounding temperature. To compensate for temperature variations, an
ambient-compensated overload relay is used. Its trip point is not affected by
temperature, and it performs consistently at the same value of current.
Thermal Overload Relay Trip Characteristics
Melting alloy and bimetallic overload relays are designed to approximate the
heat actually generated in the motor. As the motor temperature increases, so
does the temperature of the thermal unit. The motor and relay heating curves
(left) show this relationship. From this graph we can see that no matter how
high the current drawn, the overload relay will provide protection yet will not
trip unnecessarily.
Solid State Overload Relay
There are some substantial advantages to using the solid state electronic
device. The device does not require thermal units. The customer does not
have to exercise skill at the selection procedure nor is there a need to stock
5

Product Description
6
thermal units for repair or replacement. Not having to install thermal units can save from 20-30% of the
installation time for a starter or separate overload relay, as compared to the traditional NEMA devices.
The solid state device, when operated within its operating temperature range, does not require ambient
compensation. Only the level of current being drawn by the motor affects the trip of the device.
Solid state devices are typically available as part of a starter or as a separate component. This adds to
the flexibility of their application and mounting. Some solid state devices are designed to retrofit melting
alloy or bi-metal devices from the same manufacturer. This flexibility provides the user a migration path
to the new technology. Product selection and application are not dramatically different from the
traditional melting alloy or bi-metal devices. The mounting and “look” are also similar to the traditional
devices. Backward compatibility can also be useful if the decision is made to standardize on the new
technology and the user wishes to upgrade the existing installed base.
The most important feature offered by a solid state overload relay is phase loss protection. While a
phase loss causes a significant current increase in the remaining phases of the motor circuit, there is a
major increase in rotor current that can cause motor damage.
The time it takes for a melting alloy device to trip is determined only by the level of current in the
remaining phases. The majority of the motors installed (world-wide) are run at about 70% of their full
load capability. In these situations, the phase loss condition may result in a level of current in the
remaining phases just slightly above the actual FLA of the motor and, therefore, only slightly above the
rating of the thermal unit. Therefore, it could take a substantial amount of time for the melting alloy device
in this application to respond to phase loss.
The bi-metal device offers a limited form of phase loss protection by means of a differential tripping
mechanism where the device will trip somewhat faster when an overload is detected on only two of the
phases. This device contrasts with a solid state overload relay with phase loss protection that would trip
in less than three seconds and alert the user of a potential distribution system problem in advance of
motor failure. Consequently, the problem does not have an opportunity to affect other equipment on the
system.
The solid state device also provides phase unbalance protection where the device will trip if the current
on any phase is 25% greater than the average of all three phases. Phase unbalances are typically
caused by an unbalanced up-stream single phase load that can disturb phase voltages. Such a
condition can similarly lead to excessive rotor currents and motor damage.
© 1998 Square D All Rights Reserved
5/98

Type CO1R
Type SEO5
5/98
NEMA-rated Thermal Overload Relays feature:
© 1998 Square D All Rights Reserved
Thermal Overload Relays – NEMA Rated
Melting Alloy
• Exclusive One-Piece Thermal Unit • Trip Free Reset Mechanism on Types F, G & S
• Inverse Time Delay Trip
• Replaceable Contact Units on Types F, G & S
• Alarm Contact Available
Slow trip (Class 30) and quick trip (Class 10) melting alloy thermal units are available for all Size 1, 2, 5
and 6, and some Size 3 and 4 applications. Thermal units are not included.
For Separate Mounting – Melting Alloy – 600 Volts Maximum, AC or DCa
Size
Maximum Full
Load Current
(Amperes)
Open Type
for Separate Panel Mounting
Single Pole Construction (One N.C. Contact) — 1 Thermal Unit Required
1
2
3
4
5
25
45
86
133
266
Left Hand Type Right Hand Type Type
CO1
TO1
UO1
FO1L
GO11L
CO1R
TO1
UO1
FO1R
GO11R
Three Pole Construction (One Common N.C. Contact on Type S Only) — 3 Thermal Units Required
1
2
3
4
25
45
86
133
SEO5
SEO8
SEO12
SEO15
5 266 Use 3 Type GO11R Relays Listed Above ...
For Terminal Block Channel Mounting Order
Open Type Relay and Bracket Kit Below
a Maximum power circuit rating for separate mounting overload relays, Types C, F, G, T and U, is 600 volts AC or DC; Type S is 600 volts AC only.
Maximum control circuit contact rating for Types C, F, G, T, U and SDO18 is 600 volts AC and 250 volts DC; the remaining Type S versions are 600
volts AC only.
Replacement Melting Alloy Overload Relays for Square D Class 8536 Starters
Locate Class 8536 Starter in this Column Order Class 9065 Overload Relay from this Column
NEMA Size Type Series
00 SA A & B
0 SB A
1 SC A
Number of
Poles
2
3
2
3-5
2
3-5
Type
SDO4
SDO5
SDO4
SDO5
SDO4
SDO5
...
...
...
...
...
SM2
SM2
...
...
1P SC A 2 SDO10 1
2 SD A
3 SE A
4 SF A
2
3-5
2
3
4
5
3
4
5
SDO7
SDO8
SDO11
SDO12
SDO13
SDO14
SDO15
SDO16
SDO17
5 SG A 3‡ SDO18 1
6 SH A & B 3 SEO5 3
Number of Thermal
Units Required
q For 4-pole starters used on two phase systems order 2 thermal units plus one Class 9998 Type SO31 jumper strap kit for every two starters. Each kit
includes two jumper straps.
u Type S Size 5 starters use three Type SDO18 overload relays per starter.
Special Features for Melting Alloy Types
Substitute 1-N.O. isolated alarm contact and 1-N.C. contact per relay. (Type S starters only) p
1
3
1
3q
1
3q
1
3q
1
3
2
3
3
2
3
Form
Y342p
Substitute 2-N.C. contacts for standard N.C. contact per relay. (Type S starters only) Y344p
Modify Type U relay to accept Type FB quick trip or SB slow trip thermal units. (Accepts Type C standard trip) Y21k
Modify Type SDO12 relays to accept Type FB quick trip or SB slow trip thermal units, and Type F, and Type SDO15 relays to accept Type
FB quick trip thermal units. (Rejects Type CC standard trip units)
k This form cannot be field modified.
p Field modification possible. Order 9999 S04 (for Form Y342)
or 9999 S05 (for Form Y344).
Y81k
7

Thermal Overload Relays – NEMA Rated
Bimetallic
Class 9065
Type SEO6B2
Three Pole Construction
Non-Compensated
8
Bimetallic thermal overload relays feature automatic reset or hand reset and a trip-free mechanism.
There are ambient temperature-compensated versions. Note that thermal units are not included in the
shown prices.
For Separate Mounting – Bimetallic – 600 Volts Maximum AC or DCa
Description Size
Single Pole Construction (One N.C. Contact)
Non-Compensated
00, 0, 1
2
3
4
Maximum Full Load
Current (Amperes)
25
60
100
180
Three Pole Construction (One Common SPDT Contact on Type S)
Non-Compensated
Ambient Temperature-
Compensated
1
2
1
2
26
45
26
45
© 1998 Square D All Rights Reserved
Open Type for
Separate Panel Mounting
DA
GA
HA
JA
SEO6B2
SEO9B2
SEO6B
SEO9B
For additional selections see International Control Products.
a Maximum control circuit contact rating for Type S versions is 600 volts AC only.
Replacement Overload Relay for
Square D Class 8536 Bimetallic Overload Relay on an Existing Starter
Locate Class 8536 Starter in this Column
NEMA
Size
Type Series
0 SB A & B Any
1 SC A & B Any
2 SD A Any
3 SE
4 SF
5 SG A 3
6 SH A & B 3
Number of
Poles
Form Type
Bq
B1q
B2q
Bq
B1q
B2q
Bq
B1q
B2q
Number of Thermal
Units Required
1
3
3
Order Class 9065 Overload Relay
from this Column
SDO6B
SDO5B1
SDO6B2
SDO6B
SDO5B1
SDO6B2
SDO9B
SDO8B1
SDO9B2
A 3 Y59k
26005-11000 1
A
SHA01 3
3 B5k
B 26005-31000 1
A 3 Y59k
26005-11500 1
A
SJA01 3
3 B5k
B 26005-31800 1
B2Y500p
BY500p
B
B2
Number of
Thermal Units
Required
3
2
3
3
2
3
3
2
3
SEO6B2 3
SEO6B 3
SEO6B
SEO6B2
q B indicates ambient temperature-compensated bimetallic overload relay.
B1 indicates single phase non-ambient temperature compensated bimetallic overload relay.
B2 indicates polyphase non-ambient temperature compensated bimetallic overload relay.
k Form B5 and Form Y59 use 1 overload relay block per phase. B5 indicates single phase bimetallic overload relay. Y59 indicates single phase ambient
temperature compensated bimetallic overload relay.
p B2Y500 indicates bimetallic overload relay with current transformer sensing. BY500 indicates ambient temperature compensated bimetallic overload
relay with current transformer sensing. This part number does not include the current transformer assembly (Current Transformer part number
31102-084-50).
3
3
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5/98
Thermal Overload Relays – NEMA Rated
Solid State Overload Relay, Motor Logic
Base Unit
Base Unit relays feature: 3 to 1 adjustment range for trip current; phase loss and unbalance protection;
direct replacement for Type S melting alloy; and LED power indication. They are ambient insensitive and
self–powered. Electrical remote reset is also available.
Base Unit: For Separate Mounting Solid State Overload Relay
600 Volts AC Maximum
Size (3-Pole)
00Cc
0c
1c
2
3
4
5f
Additional Standard Features
• Self-powered
• Repeat trip accuracy: +/- 2%
• Normally closed trip contact
• Visible trip indication
• Trip free operation
• Ambient insensitivity
• Harmonic immunity
• Thermal memory
• Trip test function
• 3 Second trip on phase imbalance ≥25% (see Page 13)
Optional Features
Full Load
Current Range (Amperes)
3-9
6-18
9-27
15-45
30-90
45-135
90-270
• Auxiliary contacts
• Electrical remote reset
• Lug-Lug kits for separate mounting
• DIN rail adapter bracket
• Lug-Extender kit for retrofit (00C,
0, 1)
© 1998 Square D All Rights Reserved
Open Type
Trip Class 10 Trip Class 20
SSC10
SS010
SS110
SS210
SS310
SS410
SS510
SSC20
SS020
SS120
SS220
SS320
SS420
SS520
c Size 00C,
0, and 1 are supplied without lugs. Lower amperage loads can be protected by looping of power wires.
f Size 5 is a complete drop-in replacement for Square D NEMA Type “S” melting alloy, bimetallic, and Y500 overload relays only.
Base Unit: Replacement SSOLR for Retrofit of Square D Type S Starter
Solid State Overload Relay – 600 Volts AC Maximum
Locate 8536 Starter
in this column
SA
SB
SC
SD
SE
SF
SG
SH
SJ
NEMA Size
00Cp
0p
1p
2
3
4
5a
6a
7a
Full Load Current
Range (Amperes)
3-9
6-18
9-27
15-45
30-90
45-135
90-270
180-540
270-810
Order Class 9065 Overload from these columns
Open Type
Trip Class 10 Trip Class 20
SSC10
SS010
SS110
SR210
SR310
SR410
SR510
SR610
SR710
SSC20
SS020
SS120
SR220
SR320
SR420
SR520
SR620
SR720
p 00C,
0 and 1 are supplied without lugs. Lug - Extender Kits are available for Size 00C,
0 and 1.
a Size 5, 6 and 7 Replacement Overloads are overload relays only for existing NEMA Type “S” starters with Motor Logic. External CTs and additional
components are not included.
9

Thermal Overload Relays – NEMA Rated
Solid State Overload Relay, Motor Logic
Feature Base Unit
10
Feature Unit relays include all of the features found on the Base Unit relays plus: switch selectable trip
class; Class II ground fault detection; and direct replacement for Type S melting alloy. These relays will
also accept the Analog Output Module or Seriplex®
communication module. Electrical remote reset is
also available.
Feature Unit: For Separate Mounting Solid State Overload Relay
600 Volts AC Maximum
Size
(3 Pole)
00Bc
00Cc
0c
1c
2
3
4
5f
Additional Standard Features
• Self-powered
• Repeat trip accuracy: +/- 2%
• Normally closed trip contact
• Visible trip indication
• Trip free operation
• Ambient insensitivity
• Harmonic immunity
• Thermal memory
• Trip test function
• Ground fault detection
• 3 Second trip on phase imbalance ≥25% (see Page 13)
Optional Features
Full Load Current Range
(Amperes)
1.5 – 4.5
3 – 9
6 – 18
9 – 27
15 – 45
30 – 90
45 – 135
90 – 270
• Auxiliary contacts
• Electrical remote reset
• Lug-Lug kits for separate mounting
• DIN rail adapter bracket
• Lug-Extender kit for retrofit (00B,
00C,
0, 1)
• 4-20 mADC, analog output module
• Seriplex®
communication module
© 1998 Square D All Rights Reserved
Open Type
Trip Class 10/20
SFB20
SFC20
SF020
SF120
SF220
SF320
SF420
SF520
c Size 00B,
00C,
0, and 1 are supplied without lugs. Lower amperage loads can be protected by looping of power wires.
f Size 5 is a complete drop-in replacement for Square D NEMA Type “S” melting alloy, bimetallic, and Y500 overload relays only.
Feature Unit: Replacement SSOLR for Retrofit of Square D Type S Starter
Solid State Overload Relay – 600 Volts AC Maximum
Locate 8536 Starter
in this column
SA
SA
SB
SC
SD
SE
SF
SG
SH
SJ
NEMA Size
00Bp
00Cp
0p
1p
2
3
4
5a
6a
7a
Full Load Current Range
(Amperes)
1.5 – 4.5
3 – 9
6 – 18
9 – 27
15 – 45
30 – 90
45 – 135
90 – 270
180 – 540
270 – 810
Order Class 9065 Overload from this column
Open Type
Trip Class 10/20
SFB20
SFC20
SF020
SF120
ST220
ST320
ST420
ST520
ST620
ST720
p Size 00B,
00C,
0, and 1 are supplied without lugs. Lower amperage loads can be protected by looping of power wires.
a Size 5, 6 and 7 Replacement Overloads are only for existing NEMA Type “S” starters with Motor Logic. External CTs and additional components
are not included.
5/98

5/98
General
Overload relays are intended to protect motors,
controllers, and branch-circuit conductors against
excessive heating due to prolonged motor
overcurrents up to and including locked rotor
currents. Protection of the motor and the other
branch-circuit components from higher currents,
due to short circuits or grounds, is a function of the
branch-circuit fuses, circuit breakers, or motor
short-circuit protectors.
Nameplate Versus NEC Full-load Current
The 1996 NEC in Tables 430-147, 430-148, 430-
149 and 430-150 lists full-load currents according
to motor horsepower and voltage. According to
Article 430-6, these full-load currents should be
used, rather than the motor nameplate full-load
current, to determine the ampacity of conductors,
ampere ratings of switches, or branch-circuit
overcurrent devices, etc. It is specifically stated in
Article 430-6, however, that “separate motorrunning
overcurrent (overload) protection shall be
based on the motor nameplate current rating.”
Service Factor
NEMA standards for motors list service factors of
1.15 to 1.25 for general-purpose ac motors from
1/2 to 200 horsepower. Other motors, such as
totally-enclosed, fan-cooled, and motors over 200
horsepower have a standard 1.0 service factor.
Because of the way in which the standards are
established, there is no simple way of determining
the service factor without looking at the motor
nameplate. For this reason all of the thermal unit
selection tables in this catalog are designed for
1.15 to 1.25 service factor motors, except the
tables for Class 8198 High Voltage Starters.
These tables are designed for 1.0 service factor. It
is important to know when a motor has a service
factor of 1.0, because failure to recognize this fact
will result in an over-sized thermal unit selection
and reduced motor protection.
Motor Branch Circuit Design
Minimum safety provisions for the control of
motors are set forth in the National Electrical
Code. Although these minimum provisions must
be met, they are no substitutes for an intelligent
selection of protective devices made on the basis
of the motor circuit being designed. The code
recognizes this fact in Article 430, Section D,
“Where maximum branch-circuit protective device
ratings are shown in the manufacturer’s overload
relay table for use with a motor controller or are
otherwise marked on the equipment, they shall
© 1998 Square D All Rights Reserved
Thermal Overload Relays – NEMA Rated
Application Data
not be exceeded even if higher values are allowed
(by the code).”
Square D furnishes an instruction sheet with
every starter. Each instruction sheet includes
thermal unit selections and either fuse or circuit
breaker selections, or both as applicable.
The capability of industrial systems to deliver high
short circuit currents has been increasing steadily
over the years. This fact has caused much
concern about the capability of motor controllers
to withstand high current faults, without creating
hazards for personnel and destruction of
equipment. NEMA standards require that
contactors be able to interrupt currents up to 10
times full load current. Therefore, it is acceptable
for the overload relay to respond before the shortcircuit
protector up to this level. At currents above
10 times motor full load current the short circuit
protective device must respond first to minimize
equipment damage. A fully coordinated system is
achieved when the overload relays operate in
response to motor overloads before the fuses or
circuit breaker, and the fuses or circuit breaker
open the circuit before the overload relays trip or
burn out on short-circuit currents.
Proper coordination requires a thorough
knowledge of the time versus current limits of all
of the branch circuit components as well as the
time versus current trip characteristics of the
overload relay and short circuit protective device.
Overload Relays
Thermal overload relays sense motor current by
converting this current to heat in a resistance
element. The heat generated is used to open a
normally closed contact in series with a starter
coil causing the motor to be disconnected from
the line.
In spite of being relatively simple and inexpensive,
thermal overload relays are very effective in
providing motor running overcurrent protection.
This is possible because the most vulnerable part
of most motors is the winding insulation and this
insulation is very susceptible to damage by
excessively high temperature.
Being a thermal model of a motor, the thermal
overload relay will produce a shorter trip time at a
higher current similar to the way a motor will reach
its temperature limit in a shorter time at a higher
current. Similarly, in a high ambient temperature,
a thermal overload relay will trip at a lower current
or vice versa allowing the motor to be used to its
maximum capacity in its particular ambient
temperature (if the motor and the overload are in
the same ambient).
11

Thermal Overload Relays – NEMA Rated
Application Data
Cutaway View of Standard
Trip Melting Alloy
Thermal Unit
Class 9065 Type SEO5
Three-Pole Construction
Class 9065 Type CO1
Single Pole Construction
12
Once tripped, the thermal overload relay will not
reset until it has cooled, automatically allowing the
motor to cool before it can be re-started.
Square D manufactures two basic types of
thermal overload relays, the melting alloy and the
bimetallic. In some types, the bimetallic is
available in both non-compensated and ambient
temperature-compensated versions. In both
melting alloy and bimetallic, single element and
three element overloads are available.
Motor Logic Solid State overload relays use an
electronic method of detection, which responds
directly to the motor current. When tripped the
overload relay may be reset either manually or
remotely using the Remote Reset Module. The
Solid State overload relay provides overload
protection only for three phase motors rated up to
600 volts AC.
The Solid State overload relay provides protection
for phase loss and phase unbalance. In addition,
this overload relay is ambient insensitive. The
Solid State overload relay is available as a
separate trip Class 10 or 20 and as a selectable
trip Class 10/20 device.
The Motor Logic solid state overload relay must
be selected based on the FLA of the motor it is to
protect. Applications involving a motor with an
FLA less than 1.5 amps can be addressed by
passing multiple looped turns of the motor leads
through the current transformer windows.
Hand Reset Melting Alloy
Application
Hand reset melting alloy overload relays use a
eutectic alloy solder which responds to the heat
produced in a heater element by the motor
current. When tripped, the overload relay may be
reset manually after allowing a few minutes for the
motor and relay to cool and the solder to solidify.
Square D’s one-piece thermal unit construction
will provide overload protection for the majority of
motors. Repeated tripping does not affect the
original calibration. Melting alloy thermal units are
available in three designs: standard trip, slow trip
and quick trip.
© 1998 Square D All Rights Reserved
Standard Trip (Class 20)–All standard trip thermal
units provide trip characteristics for normal motor
acceleration up to approximately 7 seconds on a
full voltage start.
Slow Trip (Class 30) – Type SB thermal units
provide trip characteristics for motor acceleration
up to approximately 12 seconds on a full voltage
start. The motor should be suitable for extended
starting periods.
Quick Trip (Class 10) – Type FB thermal units are
used to protect hermetically sealed, submersible
pump and other motors which can endure locked
rotor current for a very short time, or motors which
have a low ratio of locked rotor to full load current.
Replaceable Contacts – The contact modules of
Type S, F and G overload relays are replaceable.
Refer to Page 13.
Alarm Contacts – Contact modules with one N.O.
and one N.C. contact are available for Type S, F,
an G overload relays. For Type S, specify Form
Y34-2; for Types F and G, specify Form Y34.
Y34-2 indicates a four terminal isolated contact
module and Y34 indicates a three terminal module
with a common terminal between the N.O. and
N.C. contacts. Refer to Page 13.
Contact Ratings – For the overload relay control
circuit contact ratings refer to Page 13.
5/98

5/98
Power Circuit Voltage Ratings
Type AC — 50 or 60 Hz DC
C, F, G, T, U 600 600
A, S 600 —
AF, AG, AR, AT, AU 600 600
AC — 50 or 60 Hz DC
Type
AD, AG, AR, AT, AU,
C, F, G, T, U,
SAF, SAG, SAU, SDO18
SS, SSF, SR, ST
SD & SE (Sizes 0-4 & 6),
Class 9998 Type SO1 and
Class 9999 Type SO4
and SO5 Contact
Modules
Accessories
Isolated Auxiliary Contacts for Motor Logic Overload Relays
© 1998 Square D All Rights Reserved
Thermal Overload Relays – NEMA Rated
Application Data
Overload Relay auxiliary contacts are available factory installed or in kit form for field installation on
Motor Logic Overload Relays. These contacts may be used for isolated alarm contact applications.
For Use with
DIN Adapter
NEMA
Contact
Ratings
A600
B600
The DIN adapter provides a method to mount the Motor Logic overload relay to a 35 mm DIN rail.
Lug-Lug/Lug-Extender Kits
Volts
(Minimum
of
110 volts
is recommended)
120
240
480
600
120
240
480
600
Type NEMA Size
Inductive
35% Power Factor
Make Break
Type Form Volts
Inductive
and
Resistive
Make and
Amps VA Amps VA
Break
Amperes
60
30
15
12
30
15
7.5
6.0
7200
7200
7200
7200
3600
3600
3600
6
3
1.5
1.2
3
1.5
.75
.6
A Class 9999 LL0 Lug-Lug Kit can be field installed on separately mounted overload relays. The
standard NEMA Size 00 B , 00 C , 0, and 1 Class 9065 Type SS and SF Overload Relays are supplied
without lugs. A Class 9999 LB0 Lug-Extender Kit is designed for NEMA Size 00 B , 00 C , 0, and 1 Retrofit
Starter Applications. This kit allows the lugs to be in the same location as the Class 9065 Melting Alloy
Overload Relay, eliminating the need for additional wire length.
720
720
720
720
360
360
360
360
Description
AF, AG, AR, AT, AU,
SAF, SAG, SAU
C, T, U
F
GO11
SDO18
Std. 125 .55
Std.,
Y34,
or Y342
Std.
125
250
125
250
1.1
.55
.55
.27
Y34 125 .22
SD & SE (Sizes 0-4 & 6) Std. – –
SD & SE (Sizes 0-4 & 6)
Y34 or
Y342
Class 9999 Type SO4
and SO5
Std.
SS, SF, SR, ST Std.
8536 SA-SJ 00B through 7 N.O. or N.C. Auxiliary Contact
9065 SS, SR, SF, ST 00B through 7
(Field Convertible)
For Use With
Type NEMA Size
Description
Class 9999
Parts Kit
9065 SS or SF 00 B , 00 C , 0, and 1 DIN Adapter DA01
For Use With
Type NEMA Size
Description
AC04
125 .22
125
250
Class 9999
Parts Kit
Class 9999
Parts Kit
9065 SS or SF 00B, 00C, 0, and 1 Lug-Lug Kit for separate mounting 9999 LL0
9065 SS or SF 00B , 00C , 0, and 1 Lug-Extender Kit for retrofitting existing NEMA Type “S” starters 9999 LB0
1.1
.55
13

Thermal Overload Relays – NEMA Rated
Application Data
14
L1 L2
Disconnecting Means, Provided
by User, or with Controller
1 L1 L2 L3
T1
T2
T2
T1
MOTOR
T3
Three Phase Starter
Wired to Control a
Single Phase Motor
Melting Alloy Overload Relay
Jumper Strap Kits
Remote Reset Module
The Remote Reset Module can be easily field installed on solid state overload relays. This module will
allow the overload relay to be reset from a remote location.
For Use With
Type NEMA Size
4 – 20 ma DC Communication Module
This module provides 4 - 20 madc output proportional to the percentage of current flowing to the motor,
according to the trip current adjustment setting. This feature works only on 9065 SF and ST overload relays.
Contact Units for Melting Alloy Type Overload Relays
One normally closed contact, Class 9998 Type SO1, is provided in each overload relay block on Type S
starters Sizes 00-4 and Size 6. On the Type S Size 5, a normally closed contact is provided with each of the
three overload relay blocks. The Class 9998 Type SO1 contact unit listed below is provided as standard in
each Class 9065 Type M melting alloy overload relay. Contact modules can be easily replaced and are
identified in the table below. Isolated overload relay alarm circuit contacts are available as an optional feature.
A pilot light or alarm bell can be wired in series with this contact to indicate that the overload relay has tripped.
For further information on isolated alarm contacts refer to Class 9999 Types SO4 and SO5.
Melting Alloy Overload Relay Jumper Strap Kits
Jumper strap kits are for use on three-phase manual or magnetic starters with melting alloy overload
relays only, where a three-phase starter is used to control a single-phase motor. These kits will include
two jumper straps, a wiring diagram showing how to wire a three-phase starter to control a single-phase
motor, and single-phase (one thermal unit) selection tables.
© 1998 Square D All Rights Reserved
Description
Class 9999
Parts Kit
8536 SA-SJ
9065 SS, SR, SF, ST
00B through 7
00B through 7
Remote Reset Module RR04k
8536 SE-SF
9065 SS, SR, SF, ST
3 and 4
3 and 4
Top Mounting Bracket RB34qk
q To be used to mount the remote reset module on the top of the overload relay.
k 120Vac power required.
For Use With
Type NEMA Size
Voltage Description
Class 9999
Parts Kit
9065 SF, ST 00B through 7 120Vac 4-20 madc Output AO01
9065 SF, ST 0 through 4 24Vdc 4-20 madc Output AO02
Magnetic Starter
NEMA Size Type Series
00-4
& 6
SA-SF
SH
Descriptionq
A & B Standard N.C. contact unit
Parts Kit
Number
Class 9998
Type SO1u
Standard N.C. contact unit 31102-514-50
5 SG A
N.C. and N.O. alarm (three point) contact unit 31102-514-51
q Refer to Page 11-131 for contact ratings.
u The Type SO1 is also the replacement contact unit for Class 9065 Type M melting alloy overload relays.
Class
ALL
For Starter Class 9998 Kit
Type No.
Size Type
00, 0, 1, 2
and M0 & M1
SA, SB, SC, SD and
M & T (Manual)
SO31
3,4 SE, SF SO32
5 SG None Available
5/98

K
1.34
34
Tripped
3.25
83
M
.28
7
1.06
27
1.00
25
.69
18
.41
10
Reset
Travel
R
E
S
E
T
E
F
RESET
L
N
O
Type SEO
5/98
.25
6
Type CO1
Weight - 1 / 2 Lb
Reset
Travel
1.56
40
2.75
70
2.93
74
.44
11
3.13
79
RESET
Prov. for
(3) 1/4-20
Mtg. Screws
0.5
13
(2) 8-32
Mounting Screws
4.06
103
Alarm O.L. Com.
Terminal
Connections
9.13
232
3.88
98
2.63
67
Melting Alloy Type NEMA Style
Type
Left Hand Right Hand
© 1998 Square D All Rights Reserved
Thermal Overload Relays – NEMA Rated
Approximate Dimensions
Dimensions Shipping
Weight
A B C D E F G H I J K L M N O P (Lbs)
SEO5 35 / 16 — 15 / 32 331 / 32 317 / 32 213 / 16
7 /32 11 /16 25 / 16
1 /2
SEO8 35 / 16 — 15 / 32 331 / 32 31 / 2 213 / 16
3 /16 11 /16 25 / 16
1 /2
SEO12 — 519 / 32 9 / 16 53 / 4 55 / 16 43 / 4
SEO15 — 631 / 32 9 / 16 53 / 4 55 / 16 43 / 4
Type TO1 a
Weight - 1 / 2 Lb
a Dimensions shown for Types TO1 and UO1 do not apply when Form Y342 or Y34 is supplied.
Types GO11L and GO11R
Weight - 5 Lbs
J
G
H
I
A
B
C
D
Prov. for (4) – P – Mtg. Screws
.66
17
.31
8
.94
24
2.13
54
1.06
27
R
E
S
E
T
.22
6
.44
11
1.00
25
4.75
121
RESET
2.75
70
.38
10
6.03
153
3.02
76
1.38
35
(2) 3/16 Dia.
Mounting Holes
Reset Travel
1.41
36
Prov. for
(3) #10-24
Mtg. Screws
Over Thermal
Unit
.38
10
Tripped
3.25
83
R
E
S
E
T
1.81
46
1.81
46
Left
Hand
.47
12
9 /32 1 7 / 16 3 9 / 16
9 /32 2 1 / 8 3 9 / 16
.77
20
Types FO1L and FO1R
Weight - 2 Lbs
.75
19
.94
24
(2) 5/16 Dia.
Locating Dowels
3 /4
3 /4
.27
7
4.94
125
Terminal
Connections
.28
7
1 /2
1 /2
9 /16
9 /16
Type UO1 a
Weight - 1 1 / 2 Lb
6.19
157
Alarm
O.I.
Com.
1 /2
1 /2
27 /32 1 1 3 / 8 #10 1
27 /32 1 1 3 / 8 #10 1 1 / 4
7 /8 1 1 / 2 1 3 / 4 2 # 1 / 4 3
7 /8 1 1 / 2 1 3 / 4 2 # 1 / 4 4
1.00
25
RESET
0.6
15
2.75
70
1.00
25
.44
11
Reset
Travel
R
E
S
E
T
1.41
36
.22
6
Reset Travel
Right
Hand
.47
12
2.00
51
(2) 3/16 Dia.
Mounting Holes
.38
10
.13
3
Tripped
3.25
83
Over Thermal
Unit
15

Thermal Overload Relays – NEMA Rated
Approximate Dimensions
16
Bimetallic Overload Relays
.50
13
.06
2
Class
9065
Reset
.89
23
3.75
95
2.81
71
1.00
25
Amp
Rating
3.59
91
2.30
58
.80
20
.31
8
Prov. for (4) #10
Mounting Screws
Types SEO6B and SEO6B2
Weight — 1 Lb
A
E
B
G (2 Holes)
D
K
J
L Reset
Travel
C
Outline Dimensions
Mounting
Dimensions
© 1998 Square D All Rights Reserved
Reset
Dimensions
A B C D E K L G
DA 25 31 / 2
7 /8 33 / 16 3 1
/2
GA 60 47 / 8
7 /8 33 / 16 3 1
/2
HA 100 47 / 8 11 / 4 33 / 16 31 / 2
1 /16
JA 180 515 / 16 11 / 4 33 / 16 31 / 2
1 /2
All dimensions shown in inches.
.31
8
Reset
Travel
3.94
100
.50
13
3 /8
3 /8
1 /2
3 /16
.06
2
Reset
.89
23
3.50
89
2.81
71
1.00
25
Mounting
Screw
3.34
85
2.30
58
.80
20
.31
8
Prov. for (4) #10
Mounting Screws
Types SEO9B and SEO9B2
Weight — 1 1 / 4 Lb
Maximum
Wire Size
.31
8
1 /8 10 8 2
1 /8 10 1 2
1 /8 10 00 3
1 /8 10 250 MCM 4
Reset
Travel
3.94
100
Approx.
Shipping
Weight (Lbs)
5/98

Motor Logic – Solid State Overload Relay
.89
23
2.81
71
RESET
1.00
25
1.59
40
.36
9
3.26
83
5/98
RESET
.31
8
5.32
135
4.74
(2) Holes. (2) Slots
for 8-32 Mtg. Screws
2.23
57
.27
7 .28
7
.24 Reset
6 Travel
3.90
99
120
.29
7
3.25
83
1.50
38
.30
8
1.08
27
4.45
113
2.96
75 3.56
2.26 90
57
.38
10
1.57
40
1.57
40
5.33
135
NEMA Size 3 Devices
.31
8
2.69
68
.24
6
Reset
Travel
3.80
97
4.16
106 5.02
128
.32
8
.29
7
2.96
75
.38
10
© 1998 Square D All Rights Reserved
Thermal Overload Relays – NEMA Rated
Approximate Dimensions
4.28
109
3.91
99
RESET
5.32
135
4.74
120
3.25
83
1.50
38
1.57
40
RESET
1.57
40
5.33
135
1.24
31
NEMA Size 4 Devices
1.70
43 1.84
47
NEMA Size 00 B , 00 C , 0, and 1 Devices NEMA Size 2 Devices
8.25
210
C C C
O O O
M M M 1 2 3
8
6
8
6
NEMA Size 5 Device
RESET
270
220
200
80
MeterLogic ®
160
120
5.88
149
2.25
57
7.75
197
.30
8
1.24
31
1.08
27
3.56
90
2.26
57
Note that the dimensions are for reference only; it is designed exclusively for NEMA Type “S” Size 5
starters and only for melting alloy, bimetallic, and Y500 overload relay assemblies.
1.18
30
7.38
187
.31
8
.24 Reset
6 Travel
4.53
115
.24
6
Reset
Travel
3.80
97
2.19 3.51
56 89
3.24
82
0.00
00
4.16
106 5.92
150
.32
8
17

Overload Relay Comparison
18
OVERLOAD RELAY COMPARISON
Information is subject to change without notice.
Overload Relay Type Trip Indication Reset Mechanism Solid State Overload
Allen Bradley
Bulletin 592/593
Series
Cutler Hammer
Freedom Series
Furnas Innova ®
Plus/ESP 100 ®
General Electric
Line 300 Series
Westinghouse
Advantage ®
Square D Type S
Melting Alloy
Bulletin 592
Bimetallic
Bulletin 593
Solid State
Bulletin 592
SMP1, SMP2, SMP3
Melting Alloy
Bimetallic
Melting Alloy No
Bimetallic No
Solid State
Melting Alloy
Bimetallic
Solid State
Solid State
Yes, an optical indicator
which turns yellow.
Yes, an optical indicator
which turns yellow.
Yes, yellow trip flag
appears in window.
Yes, orange trip flag
appears in window.
Yes, orange trip flag
appears in window.
Yes, reset button moves
(not noticeable).
Yes, yellow trip flag
appears in window.
Yes, yellow trip flag
appears in window.
Yes, yellow trip flag
appears in window.
No, optional light
accessory.
© 1998 Square D All Rights Reserved
Manual Only • Self Powered SMP1, SMP2 only
• External Power SMP3
Automatic
SMP1 Manual only or
selectable (Man/Auto)
SMP2, SMP3
selectable (Man/Auto)
Selectable (Man/Auto)
Selectable (Man/Auto)
Manual (must push to
reset)
Manual (must push to
reset)
Manual (must push to
reset)
Manual only, optional
Reset Module
Manual only, optional
Reset Module
Manual only, optional
Reset Module
Convertible (Man/Auto)
through dip switches.
Remote Reset module
available
Melting Alloy Yes, yellow trip flag Manual Only
Bimetallic
Solid State
Yes, yellow trip flag
appears in window.
Yes, yellow trip flag
appears in window
Selectable or Manual
Manual Only, Remote
Reset module available
• Phase Loss SMP1, SMP2, SMP3
• Grd. Fault and Jam Prot. SMP2, SMP3 only
• Selectable Trip Classes SMP2, SMP3 only 10, 15,
20, 30
• Com. Capabilities SMP3 only
• Led Indication SMP3 only
N/A
• Self Powered ESP 100
• Phase Loss
• Separate Trip Classes 10, 20, 30
• Self Powered
• Phase Loss
• Phase Unbalance (adjustable)
• Selectable Trip Classes 10, 20, 30
• 120 V control power
• Phase Loss
• Phase Unbalance
• Dip Switch settting 10, 20, 30 or none
• Grd. Fault Protection
• Self Powered
• Base and Feature Base
• Phase Loss
• Phase Unbalance
• Grd. Fault Detection Feature Base only
• Selectable Trip Classes Feature Base, 10 or 20
• Com. Capabilities Feature Base only
• 4-20 Comm. Module Feature Base only
• Harmonic Immune
• Power LED Indication
• Ambient Insensitive
5/98

5/98
General
All tables are based on the operation of the motor
and controller in the same ambient temperature,
40°C (104°F) or less. Always be certain the
correct thermal units are installed in the starter
before operating the motor. Each thermal unit
shall be installed such that its catalog number is
visible. On melting alloy thermal units the ratchet
wheel must engage the pawl assembly.
Selection Procedure
1. Determine motor data:
a. Full load current rating
b. Service factor
NOTE: If motor full load current is not known, a
tentative thermal unit selection could be made,
based on horsepower and voltage. Refer to
Page 22.
2. Motor and controller in same ambient
temperature:
a. All starter classes, except Class 8198:
1. For 1.15 to 1.25 service factor motors use
100% of motor full load current for thermal
unit selection.
2. For 1.0 service factor motors use 90% of
motor full load current for thermal unit
selection.
b. Class 8198 only:
1. For 1.0 service factor motors use 100% of
motor full load current for thermal unit
selection.
2. For 1.15 to 1.25 service factor motors use
110% of motor full load current for thermal
unit selection.
3. Motor and controller in different ambient
temperatures:
a. Multiply motor full load current by the
multiplier in Table A. Use the resultant full
load current for thermal unit selection.
4. Locate proper selection table from index,
Pages 19 and 20.
a. The proper thermal unit number will be found
adjacent, to the right of the range of full load
currents in which the motor full load current
or resultant full load current falls.
5. See Page 21 for calculation of trip current rating.
Slow Trip Thermal Unit Selection
To select Type SB slow trip thermal units, the
selection table for a standard Type B thermal unit
may be used with the following modifications: For
continuous rated motors having service factors of
1.15 to 1.25, select thermal units from the
© 1998 Square D All Rights Reserved
Thermal Unit Selection
standard Type B table using 93% (102% for Class
8198) of the full load current shown on the motor
nameplate and then substitute an SB for the B in
the thermal unit type number.
Example: A motor with a full load current of 14
amps controlled by an 8536 SCG3 would require
B22 thermal units for standard trip applications
and SB19.5 thermal units for slow trip
applications. The SB is selected by multiplying 14
amps times 93% for 13.02 amps and using this
value to select B19.5s. Then add the S prefix to
arrive at SB19.5s.
For continuous rated motors having a service
factor of 1.0, select thermal units in the same
manner using 84% (93% for Class 8198) of full
load current shown on the motor nameplate.
NOTE: SB thermal units are used on Size 0, 1, 2
and only some Size 3 applications. Check thermal
unit tables for current ranges.
Table A: Selection of Thermal Units for Special
Applications
Class of
Controller
All
Classes,
Except
8198
Class
8198
Continuous Duty
Motor Service Factor
1.15 to
1.25
Melting Alloy and
Non-Compensated
Bimetallic Relays
Ambient Temperature of Motor
Same as
Controller Ambient
Constant
10° C
(18° F)
Higher
Than
Controller
Ambient
Constant
10° C
(18° F)
Lower
Than
Controller
Ambient
Full Load Current Multiplier
1.0 0.9 1.05 1.0
1.0 0.9 0.8 .95 0.9
1.15 to
1.25
1.1 1.0 1.15 1.1
1.0 1.0 0.9 1.05 1.0
Thermal Units
Melting Alloy Bimetallic
Type of Thermal Type of
Trip
Unit Type Trip
A
AR
B AF
Standard
Standard C AU
CC
DD
E
Quick FB
Slow SB
Ambient
Temp.-
Comp.
Relays
Constant
40° C
(104° F)
or Less,
for Any
Controller
Ambient
Thermal
Unit Type
19

Thermal Unit Selection
20
Quick Trip Thermal Unit Selection
To select Type FB quick blow trip thermal units, the
selection table for a standard Type B thermal unit
may be used with the following modifications: for
continuous rated motors having service factors of
1.15 to 1.25, select thermal units from the
standard Type B table using 93% (102% for Class
8198) of the full load current shown on the motor
nameplate and then substitute a FB for the B in
the thermal unit type number.
© 1998 Square D All Rights Reserved
Example: A motor with a full load current of 14
amps controlled by an 8536 SCG3 would require
B22 thermal units for a standard trip application
and FB19.5 thermal units for quick trip
applications. The FB is selected by multiplying 14
amps times 93% for 13.02 amps and using this
value to select B19.5. Then add the F prefix to
arrive at FB19.5.
For continuous rated motors having a service
factor of 1.0, select thermal units in the same
manner using 84% (93% for Class 8198) of full
load current shown on the motor nameplate.
5/98

Controller
Starter Type Class Type tSeries Size
Manual
Starters
FHP
Manual Starters
(Small
Enclosure)
Manual
Starters
(Large
Enclosure)
Manual
Starter w/LVP
(Small Enclosure)
Manual
Starter w/LVP
(Large Enclosure)
Table continued on the next page; see Page 20 For Footnotes.
NOTE: For thermal unit selection tables for other devices including obsolete devices, consult local Square D field office.
5/98
2510
2512
8908
2510 M, T A
2510
2511
2512
8925
© 1998 Square D All Rights Reserved
Thermal Unit Selection
Thermal Unit Selection Table Number
Hand Reset Melting Alloy Bimetallic
Standard
Trip (20)
Quick Trip
(10)
Slow Trip
(30)
Non-
Compensated
F A FHP 43a .... .... .... ....
M, T A
2510 M, T A
2510
2511
2512
8908
M, T A
M-0
M-1
M-1P
M-0
M-1
M-1P
M-0
M-1
M-1P
M-0
M-1
M-1P
Manual Loom Sw. 2510 MBL, TBL A M-0 7 .... X .... ....
DC
Magnetic
Starters
AC
Magnetic
Starters
(Small
Enclosure)
7135
7136
7735
7736
8536
8904f
(Starter
In Own
Enclosure)
8933
8998
8999
(Model 3
Control Center)
I-LINE ®
and QMB
Motor
Starter
Centers
8998
8999
(Model 4
Control Center)
8998
(Model 5
Control Center)
1
1
1
2
2
2
3
3
3
4
4
4
72
72
72
73
73
73
....
....
....
....
....
....
C, D .... 1,2 65 .... X .... ....
E .... 3 9 .... .... .... ....
F .... 4 10 .... .... .... ....
G .... 5 12 .... .... .... ....
A
(8536 only)
B, C 00 17a .... .... .... ....
SA A, B 00 13 .... X .... ....
SB A 0 13 74 X 8 33
SC
A
A
1
1P
13
41
74
....
X
X
8
....
33
....
SD A 2 56 75 X 62 70
SE
A 3 18 76h 134hX 63 37u
B 3 .... .... .... 142 ....
SF
A
B
4
4
54
....
77h
....
....
....
11
144
29u
....
SG A 5 49e .... .... 38 46
SH A 6 21 .... .... 39 47
SC A
SD A
SE
1 Fusible 66 74 ....
1 Circuit Breaker 15 74 ....
2 Fusible 67 75 ....
2 Circuit Breaker 58j 75 ....
X
X
X
X
X
X
X
X
X
X
X
X
....
....
....
....
....
....
....
....
....
....
....
....
Compensated
....
....
....
....
....
....
....
....
....
....
....
....
64 33
57 70
A
3 Small Enclosure
3 Large Enclosure
16
68j
76h
76h
134hX
133hX
51 37u
B 3 .... .... .... 141 ....
SF
A
B
4
4
61
....
77h
....
....
....
35
143
29j
....
SG A 5 24 .... .... 52 46
SH A 6 20 .... .... 48 47
SC# A
SD# A
SE# A
SF# A
SG# A
SH# A
8911 DPSG A
1 Fusible 109 .... .... .... 97
1 Circuit Breaker 115 .... .... .... 103
2 Fusible 110 .... .... .... 98
2 Circuit Breaker 116 .... .... .... 104
3 Fusible 111 .... .... .... 99
3 Circuit Breaker 117 .... .... .... 105
4 Fusible 112 .... .... .... 100
4 Circuit Breaker 118 .... .... .... 106
5 Fusible 113 .... .... .... 101
5 Circuit Breaker 119 .... .... .... 107
6 Fusible
6 Circuit Breaker
114
120
....
....
20-30A 135 .... .... .... ....
40A 145 .... .... .... ....
50A 146 .... .... .... ....
....
....
....
....
102
108
21

Thermal Unit Selection
Controller
Thermal Unit Selection Table Number
Hand Reset Melting Alloy Bimetallic
Starter Type Class Type tSeries Size
Standard
Trip
Quick Trip
(10)
Slow Trip
(30)
Non-
Compensated Compensated
8198 G, S .... .... 5 .... X .... 6
8536
A (8536 only) B, C 00 14a .... .... .... ....
(Starter Used in
Multi-Motor Panel)
8538 8904c
8539 8906
SA
SB
SC
A, B
A
A
00
0
1
53
15
15
....
78
78
X
X
X
55
64
64
25
33
33
8606 8907 SD A 2 58 79 X 57 70
8630k
8640q
9089
8647
8650
8920
8922
8924
8925
8930
SE
SF
A
B
A
B
3
3
4
4
16
....
61
....
80h
....
81h
....
133hX
....
....
....
51
141
35
143
37u
....
29u
....
8736 8941 SG A 5 24e .... .... 52 46
8738
8739
SH A 6 20 .... X 48 47
AC
CB, DB, SB, UB A 0 15 78 X 64 33
Magnetic
CC, DC, SC, UC A 1 15 78 X 64 33
Starters
(Large
Enclosure) 8810
8811
CD, DD, SD, UD
CE, DE, SE, UE
CF, DF, SF, UF
A
A
A
2
3
4
58
16
61
79
80h
81h
X
133hX
....
57
51
35
70
37u
29u
8812
SE B 3 .... .... .... 141 ....
SF B 4 .... .... .... 143 ....
CG, DG, SG, UG A 5 24e .... .... 52 46
CH, DH, SH, UH A 6 20 .... X 48 47
8940
WELL-GUARD ®
WC, XC A 1 .... 78 .... .... 33
Control
WD, XD, MD, RD, VD
WE, XE, ME, RE, VE
PF, WF, XF, MF, RF, VF
XSG, NSG, MG, RG, VGa
A
A
A
A
2
3
4
5
....
....
....
....
79
80h
81h
....
....
....
....
....
....
....
....
....
70
37‡
29‡
46
XSH, VH A 6 .... .... .... .... 47
20-30A 136 .... .... .... ....
8911 DPSO A 40A 147 .... .... .... ....
50A 148 .... .... .... ....
AC
Magnetic
Part-
Winding
8998
8999
(Model 5 MCC)
SC#
SD#
SE#
A
A
A
1 Fusible
1 Circuit Breaker
2 Fusible
2 Circuit Breaker
3 Fusible
3 Circuit Breaker
127
130
128
131
129
132
....
....
....
....
....
....
....
....
....
....
....
....
....
....
....
....
....
....
121
124
122
125
123
126
AF B 4(133A) .... .... .... 30 ....
AG A 5(266A) .... .... .... 36 ....
AR A 1(25A) .... .... .... 32 ....
AT A 2(45A) .... .... .... 60 ....
AU .... 3(86A) .... .... .... 50 ....
DA A 1(25a) .... .... .... 140u ....
GA A 2(60A) .... .... .... 139u ....
HA A 3(100A) .... .... .... 138u ....
Separately
Mounted
Overload
Relays
9065
JA
C
F
A
A
B
4(180A)
1(25A)
4(133A)
....
44
19
....
82
85h
....
X
....
137u
....
....
....
....
....
G A 5(266A) 22 .... .... .... ....
MEO A (32A) 86 .... .... .... ....
1(26A) 59 83 X 23 42
S A
2(45A)
3(86A)
69
34
84
....
X
....
27
....
71
....
4(133A) 28 .... .... .... ....
T A 2(45A) 31 .... X .... ....
U .... 3(86A) 40 .... .... .... ....
t Series letters listed refer to the marking on the nameplate of the basic open type starter. When the starter is supplied in a controller containing other devices, the controller may have a different series
letter marked on the enclosure nameplate.
f Small enclosure tables apply for Class 8904 non-combination and non-reversing starters. For combination and reversing Class 8904 starters refer to the large enclosure selections, index above.
k For Class 8630 starters divide the delta connected motor full load current by 1.73, and use this quotient to select thermal units.
q For Class 8640 starters use the full load current of each motor winding as a basis for thermal unit selection - normally one-half total motor current.
c Large enclosure tables apply for Class 8904 combination and reversing starters. For non-combination and non-reversing Class 8904 starters refer to small enclosure selections.
j Use for Autotransformer Starters (Fusible and Circuit Breaker).
u Order Type E thermal units by number from Square D Company.
a Type A thermal units for full load currents lower than those listed in this table are available. For complete information, consult local Square D field office.
h Form Y81 must be specified to use quick trip (Class 10) or slow trip (Class 30) thermal units on Size 3 starters and quick trip (Class 10) thermal units on Size 4 starters.
X This device will accept Type SB slow trip (Class 30) thermal units. For selection, see Page 18.
# Refers to type number of starter in MCC, not actual type number of MCC.
e For Y500 Device select Table 151, which uses “B” Thermal Units.
22
© 1998 Square D All Rights Reserved
5/98

5/98
CALCULATION OF TRIP CURRENT
RATING
Trip Current Rating – Trip current rating is a
nominal value which approximates the minimum
current to trip an overload relay in an ambient
temperature, outside of the enclosure, of 40°C
(104°F). In all selection tables, except Class 8198
the trip current rating is 1.25 times the minimum
full load current shown for the thermal unit
selected. For Class 8198, the trip current rating is
1.15 times the minimum full load current. This
applies to bimetallic overload relays with the trip
adjustment set at 100 percent.
Calculation Procedure
1. Use the selection table for the specific
controller involved.
2. Find the minimum motor full load current listed
for the thermal unit in question.
3. Multiply that current by 1.25 (1.15 for Class
8198). The result is the trip current rating.
Example 1: Determine the thermal unit selection
and trip current rating for thermal units in a Class
8536 Type SCG3 Size 1 magnetic starter used to
control a three-phase, 1.15 service factor motor
with a full load current of 17.0 Amperes, where the
motor and controller are both located in a 40°C
(104°F) ambient temperature.
1. From Table 13 the proper selection is B32.
2. The minimum motor full load current is 16.0
Amperes.
3. Trip current rating is 16.0 x 1.25= 20.0
Amperes.
Protection Level is the relationship between trip
current rating and full load current. Protection
level, in percent, is the trip current rating divided
by the motor full load current times 100. In
Example 1 the protection level for the B32 thermal
unit is: 20.0/17.0 x 100=118%.
National Electrical Code, Section 430-32, allows a
maximum protection level of 125% for the motor in
the above example.
Minimum Trip Current (also called ultimate
current) may vary from the trip current rating
value, since ratings are established under
standardized test conditions. Factors which
influence variations include: the number of
thermal units installed, enclosure size, proximity
to heat producing devices, size of conductors
installed, ambient (room) temperature, and
others.
© 1998 Square D All Rights Reserved
Thermal Unit Selection
Except for ambient temperature-compensated
overload relays, an ambient temperature higher
than 40°C would lower the trip current, and a
lower temperature would increase it. This
variation is not a factor in selecting thermal units
for the average application, since most motor
ratings are based on an ambient temperature of
40°C, and motor capacity varies with temperature
in about the same proportion as the change in trip
current. Temperature-compensated relays
maintain a nearly constant trip current over a wide
range of ambient temperature, and are intended
for use where the relay, because of its location,
cannot sense changes in the motor ambient
temperature.
CALCULATION OF TRIP CURRENT FOR
AMBIENT TEMPERATURES OTHER
THAN 40°C
For a controller ambient temperature other than
40°C (104°F) trip current can be calculated by
applying a correction factor from the curve in
Figure 1. The approximate trip current for a
particular ambient temperature is the product of
(1) the multiplier M corresponding to the
temperature and (2) the 40°C trip current rating.
NOTE: Ambient temperature is the temperature
surrounding the starter enclosure. Normal
temperature rise inside the enclosure has been
taken into account in preparing the thermal unit
selection tables.
Example 2: Determine the trip current for the
motor and controller in Example 1, except the
controller is in a 30°C (86°F) ambient
temperature. From the curve in Figure 1 the
multiplier M is 1.1 at 30°C. Approximate Trip
Current is 16.0 x 1.25 x 1.1=22 Amperes.
Ambient Temp - Equiv. Degrees Farenheit
212
194
176
158
140
122
104
86
68
50
32
14
-4
Ambient Temp - Degrees Centigrade
100
80
60
40
20
0
-20
0
Ambient Temperature Correction
Curve for
Thermal Overload Relays
02 04 06 08 10 12 14
23

Thermal Unit Selection
24
Figure 1
APPROXIMATE THERMAL UNIT SELECTION BASED ON HORSEPOWER AND
VOLTAGE
General
Thermal units selected using approximate full load currents from the table below will provide a trip
current between 101% and 125% of full load current for many 4-pole, single speed, normal torque,
60 Hz motors. Since full load current rating of different makes and types of motors vary so widely, these
selections may not be suitable.
Thermal units should be selected on the basis of motor nameplate full load current and service factor.
Thermal unit sizes originally selected on an approximate basis should always be rechecked and
corrected at the time of installation if required.
Instructions
1. Locate motor horsepower and voltage.
2. Determine approximate full load current from the table below.
3. Use approximate full load current in place of actual nameplate full load current and follow
instructions on Page 18.
Only Use This Table When Motor Full Load Current Is Not Known
Motor
Horsepower
Motor Full Load Current
Three PH Single PH
200 V 230 V 460 V 575 V 115 V 230 V
1 /20 0.39 0.34 0.17 0.14 1.30 0.65
1 /12 0.55 0.48 0.24 0.19 1.90 0.95
1 /8 0.74 0.64 0.32 0.26 2.60 1.30
1 /6 0.90 0.78 0.39 0.31 3.24 1.62
1 /4 1.22 1.06 0.53 0.42 4.40 2.20
1 /3 1.52 1.32 0.66 0.53 5.47 2.74
1 /2 2.07 1.80 0.90 0.72 7.45 3.73
3 /4 2.88 2.50 1.25 1.00 10.1 5.07
1 3.68 3.20 1.60 1.28 12.6 6.31
11 / 2 5.18 4.50 2.25 1.80 17.2 8.59
2 6.67 5.80 2.90 2.32 21.4 10.7
3 9.66 8.40 4.20 3.36 29.1 14.5
5 15.4 13.4 6.68 5.35 42.9 21.4
71 / 2 22.6 19.6 9.82 7.86 58 29.2
10 29.7 25.8 12.9 10.3 – 36.3
15 43.6 38.0 19.0 15.2 – 49.9
20 57.4 49.9 24.9 20.0 – –
25 70.9 61.7 30.8 24.7 – –
30 84.3 73.3 36.7 29.3 – –
40 111. 96.4 48.2 38.5 – –
50 137. 119. 59.6 47.6 – –
60 163. 142. 70.8 56.6 – –
75 201. 175. 87.6 70.0 – –
100 265. 230. 115. 92.0 – –
125 327. 284. 142. 114. – –
150 389. 338. 169. 135. – –
200 511. 445. 222. 178. – –
NOTE: These currents should not be used for selection of fuses, circuit breakers or wire sizes. See NEC tables 430-148 through 430-150. For motors
rated 208-220 volts, use 230 V column. For motors rated 440 to 550 volts, use 460 and 575 V columns, respectively.
Mounting Thermal Units
Always be certain the correct thermal units are installed in the starter before operating the motor.
Thermal units should always be mounted so that their type designation can be read from the front of the
starter (see Figure 1). Melting alloy thermal units should be mounted so that the tooth of the pawl
assembly can engage the teeth of the ratchet wheel when the reset button is pushed.
Mounting surfaces of starter and thermal units should be clean and care should be taken to insure that
thermal unit mounting screws are fastened securely.
© 1998 Square D All Rights Reserved
5/98

5/98
Table 1
Motor Full-Load
Current (Amp)
1 T.U. 3 T.U.
0.33-0.36
0.37-0.40
0.41-0.45
0.46-0.52
0.53-0.59
0.60-0.66
0.67-0.73
0.74-0.81
0.82-0.91
0.92-1.02
1.03-1.14
1.15-1.29
1.20-1.42
1.43-1.64
1.65-1.80
1.81-2.10
2.11-3.20
2.31-2.61
2.62-2.99
3.00-3.37
3.38-3.94
3.95-4.24
4.25-4.54
4.55-5.29
5.30-5.73
5.74-6.35
6.36-7.08
7.09-7.83
7.84-8.47
8.48-9.83
9.84-10.5
10.6-11.4
11.5-12.8
12.9-13.9
14.0-16.1
16.2-18.0
0.29-0.32
0.33-0.36
0.37-0.39
0.40-0.47
0.48-0.56
0.57-0.63
0.64-0.69
0.70-0.77
0.78-0.86
0.87-0.96
0.97-1.11
1.12-1.23
1.24-1.37
1.38-1.55
1.56-1.75
1.76-1.92
1.93-2.16
2.17-2.50
2.51-2.81
2.82-3.16
3.17-3.40
3.41-3.76
3.77-4.00
4.01-4.68
4.69-5.18
5.19-5.51
5.52-6.19
6.20-7.12
7.13-8.15
8.16-8.60
8.61-9.21
9.22-10.1
10.2-11.2
11.3-12.0
. . . .
. . . .
Following Selections
for Size M-1 & M-1P Only.
. . . .
. . . .
16.2-17.6
17.7-20.6
20.7-23.1
23.2-26.0
. . . .
. . . .
11.3-12.1
12.2-13.6
13.7-15.3
15.4-17.3
17.4-19.1
19.2-21.7
21.8-24.2
24.3-26.0
Following Selections
for Size M-1P Only
23.2-27.1
27.2-29.2
29.3-33.0
33.1-36.0
Table 5
. . . .
. . . .
. . . .
. . . .
Thermal
Unit
Number
B 0.44
B 0.51
B 0.57
B 0.63
B 0.71
B 0.81
B 0.92
B 1.03
B 1.16
B 1.30
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B14
B 15.5
B 17.5
B 19.5
B22
B25
B 19.5
B22
B25
B 28.0
B32
B36
B40
B45
B36
B40
B45
B50
Index and Instructions: Pages 18-20
Table 2
Motor Full-Load
Current (Amp)
1 T.U. 3 T.U.
0.35-0.38
0.39-0.43
0.44-0.48
0.49-0.56
0.57-0.63
0.64-0.71
0.72-0.78
0.79-0.88
0.89-0.99
1.00-1.15
1.16-1.23
1.24-1.43
1.44-1.51
1.52-1.75
1.76-1.93
1.94-2.25
2.26-2.47
2.48-2.81
2.82-3.20
3.21-3.63
3.64-4.19
4.20-4.53
4.54-4.89
4.90-5.68
5.69-6.27
6.28-6.85
6.86-7.73
7.74-8.50
8.51-9.29
9.30-10.4
10.5-11.3
11.4-12.3
12.4-13.9
14.0-15.0
15.1-18.0
0.30-0.32
0.33-0.37
0.38-0.39
0.40-0.48
0.49-0.57
0.58-0.64
0.65-0.70
0.71-0.78
0.79-0.87
0.88-0.98
0.99-1.13
1.14-1.25
1.26-1.40
1.41-1.58
1.59-1.79
1.80-1.91
1.92-2.20
2.21-2.55
2.56-2.87
2.88-3.24
3.25-3.48
3.49-3.85
3.86-4.10
4.11-4.79
4.80-5.31
5.32-5.65
5.66-6.35
6.36-7.31
7.32-8.34
8.35-8.84
8.85-9.47
9.48-10.4
10.5-11.5
11.6-12.0
. . . .
Following Selections
for Size M-1 & M-1P Only.
. . . .
15.1-17.4
17.5-19.2
19.3-22.0
22.1-24.6
24.7-26.0
. . . .
. . . .
11.6-12.4
12.5-14.0
14.1-15.8
15.9-17.8
17.9-19.7
19.8-22.4
22.5-25.1
25.1-26.0
Following Selections
for Size M-1POnly.
24.7-29.1
29.2-31.7
31.8-36.0
. . . .
. . . .
. . . .
Thermal
Unit
Number
B 0.44
B 0.51
B 0.57
B 0.63
B 0.71
B 0.81
B 0.92
B 1.03
B 1.16
B 1.30
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B14
B 15.5
B 17.5
B 19.5
B22
B 19.5
B22
B25
B 28.0
B32
B36
B40
B45
B36
B40
B45
© 1998 Square D All Rights Reserved
Table 3
Motor Full-Load
Current (Amp)
1 T.U. 3 T.U.
0.29-0.31
0.32-0.36
0.37-0.39
0.40-0.47
0.48-0.56
0.57-0.63
0.64-0.69
0.70-0.77
0.78-0.86
0.87-0.97
0.98-1.12
1.13-1.24
1.25-1.39
1.40-1.57
1.58-1.78
1.79-1.96
1.97-2.20
2.21-2.41
2.42-2.75
2.76-3.25
3.26-3.50
3.51-3.87
3.88-4.13
4.14-4.69
4.70-5.20
5.21-5.53
5.54-6.23
6.24-7.18
7.19-8.20
8.21-8.98
8.99-9.63
9.64-10.6
10.7-11.8
11.9-12.7
12.8-14.3
14.4-16.1
16.2-18.0
0.28-0.29
0.30-0.33
0.34-0.36
0.37-0.44
0.45-0.52
0.53-0.59
0.60-0.64
0.65-0.71
0.72-0.80
0.81-0.90
0.91-1.03
1.04-1.14
1.15-1.27
1.28-1.44
1.45-1.63
1.64-1.79
1.80-2.01
2.02-2.19
2.20-2.52
2.53-2.95
2.96-3.17
3.18-3.50
3.51-3.73
3.74-4.22
4.23-4.68
4.69-4.98
4.99-5.59
5.60-6.43
6.44-7.41
7.42-8.02
8.03-8.59
8.60-9.52
9.53-10.5
10.6-11.2
11.3-12.0
. . . .
. . . .
Following Selections
for Size M-1 & M-1P Only.
. . . .
. . . .
16.2-18.3
18.4-20.2
20.3-23.0
23.1-26.0
. . . .
. . . .
11.3-12.7
12.8-14.3
14.4-16.1
16.2-17.8
17.9-20.1
20.2-22.6
22.7-25.5
25.6-26.0
Following Selections
for Size M-1P Only
25.9-29.0
29.1-30.8
30.9-32.7
32.8-36.0
. . . .
. . . .
. . . .
. . . .
Thermal Unit Selection
Tables 1 thru 6
Thermal
Unit
Number
B 0.44
B 0.51
B 0.57
B 0.63
B 0.71
B 0.81
B 0.92
B 1.03
B 1.16
B 1.30
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B14
B 15.5
B 17.5
B 19.5
B22
B25
B 28.0
B22
B25
B 28.0
B32
B36
B40
B45
B50
B45
B50
B56
B62
Table 4
Motor Full-Load
Current (Amp)
1 T.U. 3 T.U.
0.32-0.33
0.34-0.38
0.39-0.41
0.42-0.50
0.51-0.61
0.62-0.68
0.69-0.74
0.75-0.83
0.84-0.93
0.94-1.05
1.06-1.21
1.22-1.34
1.35-1.50
1.51-1.70
1.71-1.93
1.94-2.12
2.13-2.38
2.39-2.61
2.62-2.99
3.00-3.53
3.54-3.80
3.81-4.21
4.22-4.49
4.50-5.10
5.11-5.66
5.67-6.03
6.04-6.79
6.80-7.84
7.85-8.96
8.97-9.82
9.83-10.4
10.5-11.6
11.7-12.9
13.0-13.9
14.0-15.7
15.8-18.0
0.29-0.30
0.31-0.35
0.36-0.37
0.38-0.45
0.46-0.54
0.55-0.61
0.62-0.66
0.67-0.74
0.75-0.83
0.84-0.93
0.94-1.07
1.08-1.19
1.20-1.33
1.34-1.51
1.52-1.70
1.71-1.87
1.88-2.10
2.11-2.29
2.30-2.63
2.64-3.09
3.10-3.32
3.33-3.67
3.68-3.91
3.92-4.43
4.44-4.91
4.92-5.23
5.24-5.88
5.89-6.77
6.78-7.90
7.91-8.44
8.45-9.05
9.06-9.99
10.0-11.0
11.1-11.9
12.0-12.0
. . . .
Following Selections
for Size M-1 & M1P Only.
. . . .
. . . .
17.8-20.1
20.2-22.2
22.3-25.3
25.4-26.0
. . . .
12.0-13.4
13.5-15.1
15.2-17.0
17.1-18.9
19.0-21.4
21.5-24.0
24.1-26.0
Following Selections
for Size M-1P Only.
25.4-28.4
28.5-33.1
33.2-36.0
. . . .
. . . .
. . . .
Thermal
Unit
Number
B 0.44
B 0.51
B 0.57
B 0.63
B 0.71
B 0.81
B 0.92
B 1.03
B 1.16
B 1.30
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B14
B 15.5
B 17.5
B 19.5
B22
B25
B22
B25
B 28.0
B32
B36
B40
B45
Current Transformer Ratio Thermal
Unit
25/5 50/5 75/5 100/5 150/5 200/5 250/5 300/5 400/5 500/5 Number
Motor Full-Load Current
10.6-11.7 21.1-23.6 31.7-35.4 42.3-47.2 63.4-70.9 84.5-94.6 106.-117. 127.-141. 169.-188. 211.-236. B 3.00
11.8-13.2 23.7-26.5 35.5-39.8 47.3-53.1 71.0-79.7 94.7-105. 118.-132. 142.-159. 189.-212. 237.-265. B 3.30
13.3-14.8 26.6-29.6 39.9-44.5 53.2-59.4 79.8-89.1 106.-118. 133.-148. 160.-177. 213.-237. 266.-296. B 3.70
14.9-17.2 29.7-34.5 44.6-51.8 59.5-69.2 89.2-103. 119.-138. 149.-172. 178.-207. 238.-276. 297.-345. B 4.15
17.3-19.6 34.6-39.2 51.9-58.9 69.3-78.6 104.-117. 139.-156. 173.-196. 208.-235. 277.-314. 346.-360. B 4.85
19.7-22.3 39.3-44.6 59.0-67.0 78.7-89.3 118.-133. 157.-178. 197.-223. 236.-267. 315.-357. . . . . B 5.50
Table 6
Current Transformer Ratio Thermal
Unit
25/5 50/5 75/5 100/5 150/5 200/5 250/5 300/5 400/5 500/5 Number
Motor Full-Load Current
10.6-11.7 21.2-23.9 31.8-35.9 42.4-47.9 63.6-72.0 84.8-96.0 106.-119. 127.-143. 170.-191. 212.-239. AR 3.62
12.0-13.4 24.0-26.9 36.0-40.3 48.0-53.8 72.1-80.8 96.1-107. 120.-134. 144.-161. 192.-215. 240.-269. AR 3.98
13.5-15.0 27.0-30.0 40.4-45.1 53.9-60.1 80.9-90.2 108.-119. 135.-150. 162.-180. 216.-240. 270.-300. AR 4.37
15.1-16.6 30.1-33.4 45.2-50.1 60.2-66.9 90.3-99.4 120.-133. 151.-166. 181.-200. 241.-267. 301.-334. AR 4.80
16.7-18.7 33.5-37.5 50.2-56.3 67.0-75.1 100.-112. 134.-149. 167.-187. 201.-225. 268.-300. 335.-360. AR 5.3
18.8-20.7 37.6-41.4 56.4-62.2 75.2-82.9 113.-124. 150.-165. 188.-207. 226.-248. 301.-331. . . . . AR 5.8
20.8-22.8 41.5-45.7 62.3-68.5 83.0-91.4 125.-136. 166.-182. 208.-228. 249.-274. 332.-365. . . . . AR 6.4
B40
B45
B50
25

Thermal Unit Selection
Tables 7 thru 12
26
Table 7
Single Phase
Single
PH
Motor
Full-
Load
Current
(Amp)
0.33-0.36
0.37-.040
0.41-0.45
0.46-0.52
0.53-0.59
0.60-0.66
0.67-0.73
0.74-0.81
0.82-0.91
0.92-1.02
1.03-1.14
1.15-1.29
1.30-1.42
1.43-1.64
1.65-1.80
1.81-2.10
2.11-2.30
2.31-2.61
2.62-2.99
3.00-3.37
3.38-3.94
3.95-4.24
4.25-4.54
4.55-5.29
5.30-5.73
5.74-6.35
6.36-7.08
7.09-7.83
7.84-8.47
8.48-9.83
9.84-10.5
10.6-11.4
11.5-12.8
12.9-13.9
14.0-16.1
16.2-18.0
Table 9
Thermal
Unit
No.
B 0.44
B 0.51
B 0.57
B 0.63
B 0.71
B 0.81
B 0.92
B 1.03
B 1.16
B 1.30
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B14
B 15.5
B 17.5
B 19.5
B 22.
B 25.
Motor
Full-Load
Current (Amp)
15.3-16.7
16.8-19.8
19.9-22.8
22.9-25.8
25.9-30.4
30.5-31.9
32.0-34.2
34.3-38.8
38.9-44.2
44.3-50.2
50.3-57.1
57.2-63.2
63.3-68.6
68.7-78.6
78.7-86.9
87.0-100.0
Maximum Fuse Rating
(Amp)
Single-
Motor
Installation
(N.E.C.
430-52)
Thermal
Unit
Number
C20
C22
C26
C30
C34
C40
C42
C45
C51
C58
0.6
0.8
0.8
1
1.125
1.25
1.4
1.6
1.8
2.0
2.25
2.5
2.8
3.2
3.5
4.0
4.5
5.0
5.6
6.25
7
8
9
10
10
12
12
12
17.5
17.5
20
20
25
25
25
25
C66
C75
C83
C90
C 103
C 114
Group Motor
Installation
(N.E.C. 430-53)
Class
K-9 or
Unclassified
Fuse
15
15
15
15
15
15
15
15
20
20
20
20
20
25
25
25
25
30
30
30
30
30
30
30
30
30
30
30
30
30
Class
K-5
Fuse
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
Group Fusing
Restrictions
Maximum
thermal unit
size: B 12.8
Maximum
branch-circuit
available
current: 5,000
Amp
symmetrical
Table 10
Motor
Full-Load
Current (Amp)
43.6-47.3
47.4-51.3
51.4-54.6
54.7-59.7
59.8-65.1
65.2-70.1
70.2-75.1
75.2-82.2
82.3-89.2
89.3-96.5
96.6-104.
105.-113.
114.-123.
124.-132.
133.-150.
Polyphase
Single
PH
Motor
Full-
Load
Current
(Amp)
0.29-0.32
0.33-0.36
0.37-0.39
0.40-0.47
0.53-0.59
0.57-0.63
0.64-0.69
0.70-0.77
0.78-0.86
0.87-0.96
0.97-1.11
1.12-1.23
1.24-1.37
1.38-1.55
1.56-1.75
1.76-1.92
1.93-2.16
2.17-2.50
2.51-2.81
2.82-3.16
3.17-3.40
3.41-3.76
3.77-4.00
4.01-4.68
4.69-5.18
5.19-5.51
5.52-6.19
6.20-7.12
7.13-8.15
8.16-8.60
10.2-11.2
9.22-10.1
10.2-11.2
Thermal
Unit
No.
B 0.44
B 0.51
B 0.57
B 0.63
B 0.71
B 0.81
B 0.92
B 1.03
B 1.16
B 1.30
© 1998 Square D All Rights Reserved
Maximum Fuse Rating
(Amp)
Single-
Motor
Installation
(N.E.C.
430-52)
0.6
0.6
0.8
0.8
1
1.25
1.4
1.4
1.6
1.8
B 1.45 2
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B14
11.3-12.0 B 19.5
Thermal
Unit
Number
CC 54.5
CC 59.4
CC 64.3
CC 68.5
CC 74.6
CC 81.5
CC 87.7
CC 94.0
CC 103
CC 112
CC 121
CC 132
CC 143
CC 156
CC 167
2.5
2.5
2.8
3.5
3.5
4
4.5
5.6
6.25
7
7
8
9
10
10
12
12
15
17.5
17.5
20
B 15.5 20
B 17.5 600 V
Max.
20
250 V
Max.
25
Group Motor
Installation
(N.E.C. 430-53)
Class
K-9 or
Unclassified
Fuse
15
15
15
15
15
15
15
15
20
20
20
20
20
25
25
25
25
30
30
30
30
30
30
30
30
30
30
30
30
30
30
Class
K-5
Fuse
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
Group Fusing
Restrictions
Maximum
thermal unit
size: B 14
Maximum
branch-circuit
available
current: 5,000
Amp
symmetrical
Table 11
Motor
Full-Load
Current (Amp)
2 T.U. 3 T.U.
33.0-36.1
36.2-40.2
40.3-44.5
45.6-51.3
51.4-58.5
58.6-62.6
62.7-71.3
71.4-77.1
77.2-86.9
87.0-93.3
93.4-102.
103.-107.
108.-112.
113.-121.
122.-123.
124.-133.
. . . .
30.5-33.4
33.5-37.1
37.2-42.0
42.1-47.0
47.1-53.5
53.6-57.5
57.6-64.4
64.5-69.4
69.5-77.4
77.5-83.6
83.7-92.9
93.0-100.
101.-104.
105.-115.
116.-119.
120.-123.
124.-133.
Table 8
Motor Full-Load Current (Amp) Thermal
Unit
2.T.U.1 PH 2 T.U.2 PH 3 T.U. Number
0.37-0.39
0.40-0.42
0.43-0.46
0.47-0.50
0.51-0.54
0.55-0.59
0.60-0.65
0.66-0.71
0.72-0.78
0.79-0.86
0.87-0.94
0.95-1.04
1.05-1.14
1.15-1.25
1.26-1.42
1.43-1.62
1.63-1.75
1.76-1.91
1.92-2.07
2.08-2.25
2.26-2.47
2.48-2.73
2.74-2.99
3.00-3.31
3.32-3.71
3.72-4.15
4.16-4.65
4.66-5.11
5.12-5.68
5.69-6.24
6.25-7.15
7.16-7.84
7.85-8.56
8.57-9.40
9.41-10.2
10.3-10.7
10.8-12.2
12.3-14.1
14.2-15.9
16.0-18.0
0.37-0.39
0.40-0.42
0.43-0.46
0.47-0.50
0.51-0.54
0.55-0.59
0.60-0.65
0.66-0.71
0.72-0.78
0.79-0.86
0.87-0.94
0.95-1.04
1.05-1.14
1.15-1.25
1.26-1.42
1.43-1.62
1.63-1.75
1.76-1.91
1.92-2.07
2.08-2.25
2.26-2.47
2.48-2.73
2.74-2.99
3.00-3.31
3.32-3.71
3.72-4.15
4.16-4.65
4.66-5.11
5.12-5.68
5.69-6.24
6.25-7.15
7.16-7.84
7.85-8.56
8.57-9.40
9.41-10.2
10.3-10.7
10.8-12.2
. . . .
. . . .
. . . .
0.30-0.31
0.32-0.34
0.35-0.37
0.38-0.41
0.42-0.45
0.46-0.49
0.50-0.54
0.55-0.56
0.57-0.62
0.63-0.68
0.69-0.75
0.76-0.82
0.83-0.91
0.92-1.00
1.01-1.18
1.19-1.30
1.31-1.41
1.42-1.53
1.54-1.69
1.70-1.79
1.80-2.02
2.03-2.19
2.20-2.43
2.44-2.81
2.82-3.12
3.13-3.47
3.48-3.89
3.90-4.30
4.31-4.69
4.70-5.19
5.20-5.93
5.94-6.45
6.46-7.08
7.09-7.71
7.72-8.39
8.40-8.64
8.65-9.74
9.75-11.0
11.1-12.0
. . . .
Following Selections for Size 1 Only
. . . .
. . . .
. . . .
16.0-18.1
18.2-20.8
20.9-23.6
23.7-26.0
. . . .
. . . .
Thermal
Unit
Number
AU 44
AU 50
AU 56
AU 64
AU 72
AU 81
AU 88
AU 99
AU 110
AU 123
AU 135
AU 152
AU 169
AU 183
AU 198
AU 217
AU 235
10.8-12.2
12.3-14.4
14.2-15.9
16.0-18.1
18.2-20.8
20.9-23.6
23.7-26.0
. . . .
. . . .
Table 12
Motor
Full-Load
Current (Amp)
92.-100.
101.-109.
110.-119.
120.-131.
132.-139.
140.-156.
157.-166.
167.-180.
181.-189.
190.-209.
210.-225.
226.-238.
239.-263.
264.-300.
. . . .
. . . .
11.1-12.4
12.5-13.9
14.0-15.9
16.0-17.7
17.8-20.3
20.4-22.8
22.9-26.0
Thermal
Unit
Number
5/98
AR .45
AR .49
AR .54
AR .59
AR .65
AR .71
AR .78
AR .86
AR .95
AR 1.05
AR 1.15
AR 1.26
AR 1.39
AR 1.53
AR 1.68
AR 1.85
AR 2.04
AR 2.24
AR 2.46
AR 2.71
AR 2.98
AR 3.28
AR 3.62
AR 3.98
AR 4.37
AR 4.80
AR 5.3
AR 5.8
AR 6.4
AR 7.0
AR 7.7
AR 8.5
AR 9.3
AR 10.2
AR 11.2
AR 12.4
AR 13.6
AR 15.4
AR 17.6
AR 20.5
AR 13.6
AR 15.4
AR 17.6
AR 20.5
AR 23
AR 27
AR 30
AR 35
AR 40
DD 122
DD 121
DD 128
DD 140
DD 150
DD 160
DD 185
DD 213
DD 220
DD 230
DD 250
DD 265
DD 280
DD 300

5/98
Table 13
Motor
Full-Load Current (Amp)
1.T.U. 2 T.U. 3 T.U.
0.29-0.31
0.32-0.34
0.65-0.38
0.39-0.45
0.46-0.54
0.55-0.61
0.62-0.66
0.67-0.73
0.74-0.81
0.82-0.94
0.95-1.05
1.06-1.22
1.23-1.34
1.35-1.51
1.52-1.71
1.72-1.93
1.94-2.14
2.15-2.40
2.41-2.72
2.73-3.15
3.16-3.55
3.56-4.00
4.01-4.40
4.41-4.88
4.89-5.19
5.20-5.73
5.74-6.39
6.40-7.13
7.14-7.90
7.91-8.55
8.56-9.53
9.54-10.6
10.7-11.8
11.9-13.2
13.3-14.9
0.29-0.31
0.32-0.34
0.35-0.38
0.39-0.45
0.46-0.54
0.55-0.61
0.62-0.66
0.67-0.73
0.74-0.81
0.82-0.94
0.95-1.05
1.06-1.22
1.23-1.34
1.35-1.51
1.52-1.71
1.72-1.93
1.94-2.14
2.15-2.40
2.41-2.72
2.73-3.15
3.16-3.55
3.56-4.00
4.01-4.40
4.41-4.88
4.89-5.19
5.20-5.73
5.74-6.39
6.40-7.13
7.14-7.90
7.91-8.55
15.0-16.6 . . . .
16.7-18.0 . . . .
8.56-9.53
9.54-10.6
10.7-11.8
11.9-12.0
. . . .
0.28-0.30
0.31-0.34
0.35-0.37
0.38-0.44
0.45-0.53
0.54-0.59
0.60-0.64
0.65-0.72
0.73-0.80
0.81-0.90
0.91-1.03
1.04-1.14
1.15-1.27
1.28-1.43
1.44-1.62
1.63-1.77
1.78-1.97
1.98-2.32
2.33-2.51
2.52-2.99
3.00-3.42
3.43-3.75
3.76-3.98
3.99-4.48
4.49-4.93
4.94-5.21
5.22-5.84
5.85-6.67
6.68-7.54
7.55-8.14
8.15-8.72
8.73-9.66
9.67-10.5
10.6-11.3
11.4-12.0
. . . .
. . . .
Following Selections for Size 1 Only
. . . .
. . . .
. . . .
16.7-18.9
19.0-21.2
21.3-23.0
23.1-25.5
25.6-26.0
. . . .
Table 16
11.9-13.2
13.3-14.9
15.0-16.6
16.7-18.9
19.0-21.2
21.3-23.0
23.1-25.5
25.6-26.0
. . . .
Motor
Full-Load Current (Amp)
. . . .
11.4-12.7
12.8-14.1
14.2-15.9
16.0-17.5
17.6-19.7
19.8-21.9
22.0-24.4
24.5-26.0
1.T.U. 2 T.U. 3 T.U.
16.2-17.5
17.6-18.8
18.9-20.5
20.6-22.2
22.3-23.7
23.8-25.4
25.5-27.3
27.4-29.3
29.4-31.4
31.6-33.9
34.0-36.2
36.3-39.3
39.4-42.3
42.4-45.3
45.4-48.3
48.4-52.0
52.1-54.9
55.0-59.7
59.8-65.4
65.5-69.6
69.7-74.8
74.9-79.7
79.8-83.1
83.2-86.0
. . . .
. . . .
. . . .
. . . .
15.1-16.2
16.3-17.3
17.4-19.5
19.5-20.7
20.8-22.3
22.4-24.0
24.1-25.7
25.8-27.5
27.6-29.6
29.7-31.7
31.8-33.9
34.0-36.6
36.7-39.3
39.4-42.3
42.4-44.9
45.0-48.3
48.4-50.9
51.0-55.5
55.6-59.9
60.0-64.2
64.3-68.7
68.8-71.4
71.5-74.8
74.9-78.0
78.1-80.7
80.8-86.0
. . . .
. . . .
14.3-15.4
15.5-16.4
16.5-18.5
18.6-19.6
19.7-21.1
21.2-22.7
22.8-24.4
24.5-26.1
26.2-28.1
28.2-30.0
30.1-32.1
32.2-34.7
34.8-37.3
37.4-40.1
40.2-42.6
42.7-45.8
45.9-48.3
48.4-52.6
52.7-56.8
56.9-60.9
61.0-65.1
65.2-67.7
67.8-70.9
71.0-73.9
74.0-76.5
76.6-80.2
80.3-83.1
83.2-86.0
Thermal
Unit
Number
B 0.44
B 0.51
B 0.57
B 0.63
B 0.71
B 0.81
B 0.92
B 1.03
B 1.16
B 1.30
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B14
B 15.5
B 17.5
B 19.5
B22
B25
B 28.0
B 19.5
B22
B25
B 28.0
B32
B36
B40
B45
B50
Thermal
Unit
Number
CC 20.9
CC 22.8
CC 24.6
CC 26.3
CC 28.8
CC 31.0
CC 33.3
CC 36.4
CC 39.6
CC 42.7
CC 46.6
CC 50.1
CC 54.5
CC 59.4
CC 64.3
CC 68.5
CC 74.6
CC 81.5
CC 87.7
CC 94.0
CC 103
CC 112
CC 121
CC 132
CC 143
CC 156
CC 167
CC 180
Table 14
Motor
Full-Load Current (Amp)
1.T.U. 2 T.U. 3 T.U.
0.43-0.47
0.48-0.51
0.52-0.56
0.57-0.64
0.65-0.69
0.70-0.76
0.77-0.84
0.85-0.91
0.92-1.01
1.02-1.15
1.16-1.23
1.24-1.37
1.38-1.45
1.46-1.56
1.57-1.67
1.68-1.77
1.78-1.92
1.93-2.09
2.10-2.31
2.32-2.56
2.57-2.92
2.93-3.16
3.17-3.48
3.49-3.83
3.84-4.24
4.25-4.62
4.63-4.92
4.93-5.61
5.62-5.85
5.86-6.36
6.37-6.99
7.00-7.67
7.68-8.15
8.16-9.00
Table 17
0.41-0.45
0.46-0.50
0.51-0.55
0.56-0.62
0.63-0.67
0.68-0.72
0.73-0.81
0.82-0.88
0.89-0.97
0.98-1.08
1.09-1.18
1.19-1.32
1.33-1.40
1.41-1.48
1.49-1.60
1.61-1.72
1.73-1.84
1.85-2.00
2.01-2.22
2.23-2.45
2.46-2.82
2.83-3.08
3.09-3.39
3.40-3.75
3.76-4.16
4.17-4.51
4.52-4.83
4.84-5.49
5.50-5.67
5.68-6.16
6.17-6.75
6.76-7.00
. . . .
. . . .
Motor
Full-Load Current (Amp)
© 1998 Square D All Rights Reserved
0.40-0.41
0.42-0.46
0.47-0.51
0.52-0.57
0.58-0.62
0.63-0.67
0.68-0.75
0.76-0.80
0.81-0.89
0.90-1.02
1.03-1.09
1.10-1.21
1.22-1.29
1.30-1.37
1.38-1.48
1.49-1.58
1.59-1.72
1.73-1.85
1.86-2.05
2.06-2.29
2.30-2.62
2.63-2.84
2.85-3.10
3.11-3.46
3.47-3.85
3.86-4.16
4.17-4.46
4.47-5.08
5.09-5.35
5.36-5.82
5.83-6.34
6.35-6.95
6.96-7.00
. . . .
1.T.U. 2 T.U. 3 T.U.
0.42-0.46
0.47-0.50
0.51-0.55
0.56-0.62
0.63-0.67
0.68-0.73
0.74-0.81
0.82-0.89
0.90-0.98
0.99-1.12
1.13-1.20
1.21-1.34
1.35-1.41
1.42-1.51
1.52-1.62
1.63-1.73
1.74-1.86
1.87-2.02
2.03-2.25
2.26-2.46
2.47-2.77
2.78-2.99
3.00-3.26
3.27-3.59
3.60-3.99
4.00-4.42
4.43-4.61
4.62-5.23
5.24-5.39
5.40-5.88
5.89-6.56
6.57-7.18
7.19-7.80
7.81-9.00
0.39-0.43
0.44-0.47
0.48-0.52
0.53-0.58
0.59-0.64
0.65-0.68
0.69-0.77
0.78-0.84
0.85-0.93
0.94-1.05
1.06-1.13
1.14-1.25
1.26-1.33
1.34-1.42
1.43-1.52
1.53-1.63
1.64-1.75
1.76-1.90
1.91-2.13
2.14-2.33
2.34-2.73
2.74-2.86
2.87-3.14
3.15-3.47
3.48-3.83
3.84-4.16
4.17-4.43
4.44-5.00
5.01-5.16
5.17-5.56
5.57-6.22
6.23-6.89
6.90-7.00
. . . .
0.38-0.40
0.41-0.44
0.45-0.49
0.50-0.55
0.56-0.60
0.61-0.65
0.66-0.72
0.73-0.79
0.80-0.88
0.89-0.98
0.99-1.07
1.08-1.17
1.18-1.25
1.26-1.33
1.34-1.44
1.45-1.53
1.54-1.65
1.66-1.79
1.80-1.99
2.00-2.18
2.19-2.45
2.46-2.65
2.66-2.90
2.91-3.19
3.20-3.56
3.57-3.83
3.84-4.08
4.09-4.64
4.65-5.00
5.01-5.36
5.37-5.87
5.88-6.43
6.44-6.79
6.80-7.00
Thermal
Unit
Number
A .49
A .54
A .59
A .65
A .71
A .78
A .86
A .95
A 1.02
A 1.16
A 1.25
A 1.39
A 1.54
A 1.63
A 1.75
A 1.86
A 1.99
A 2.15
A 2.31
A 2.57
A 2.81
A 3.61
A 3.95
A 4.32
A 4.79
A 5.30
A 5.78
A 6.20
A 6.99
A 7.65
A 8.38
A 9.25
A 9.85
A 11.0
Thermal
Unit
Number
A .49
A .54
A .59
A .65
A .71
A .78
A .86
A .95
A 1.02
A 1.16
A 1.25
A 1.39
A 1.54
A 1.63
A 1.75
A 1.86
A 1.99
A 2.15
A 2.31
A 2.57
A 2.81
A 3.61
A 3.95
A 4.32
A 4.79
A 5.30
A 5.78
A 6.20
A 6.99
A 7.65
A 8.38
A 9.25
A 9.85
A 11.0
Thermal Unit Selection
Tables 13 thru 18
Table 15
Motor
Full-Load Current (Amp)
1.T.U. 2 T.U. 3 T.U.
0.31-0.33
0.34-0.36
0.37-0.40
0.41-0.48
0.49-0.57
0.58-0.64
0.65-0.70
0.71-0.77
0.78-0.85
0.86-0.99
1.00-1.10
1.11-1.28
1.29-1.41
1.42-1.58
1.59-1.80
1.81-2.03
2.04-2.25
2.26-2.51
2.52-2.83
2.84-3.29
3.30-3.75
3.76-4.22
4.23-4.65
4.66-5.16
5.17-5.53
5.54-6.09
6.10-6.80
6.81-7.60
7.61-8.35
8.36-9.04
9.05-9.99
10.0-11.1
11.2-12.3
12.4-13.7
13.8-15.4
0.31-0.33
0.34-0.36
0.37-0.40
0.41-0.48
0.49-0.57
0.58-0.64
0.65-0.70
0.71-0.77
0.78-0.85
0.86-0.99
1.00-1.10
1.11-1.28
1.29-1.41
1.42-1.58
1.59-1.80
1.81-2.03
2.04-2.25
2.26-2.51
2.52-2.83
2.84-3.29
3.30-3.75
3.76-4.22
4.23-4.65
4.66-5.16
5.17-5.53
5.54-6.09
6.10-6.80
6.81-7.60
7.61-8.35
8.36-9.04
9.05-9.99
10.0-11.1
11.2-12.0
. . . .
. . . .
0.29-0.31
0.32-0.36
0.37-0.38
0.39-0.46
0.47-0.55
0.56-0.61
0.62-0.66
0.67-0.75
0.76-0.83
0.84-0.93
0.94-1.06
1.07-1.18
1.19-1.31
1.32-1.47
1.48-1.67
1.68-1.83
1.84-2.04
2.05-2.38
2.38-2.60
2.61-3.13
3.14-3.59
3.60-3.94
3.95-4.19
4.20-4.72
4.73-5.21
5.22-5.51
5.52-6.17
6.18-7.07
7.08-8.05
8.06-8.69
8.70-9.32
9.33-10.2
10.3-11.3
11.4-12.0
. . . .
Thermal
Unit
Number
B 0.44
B 0.51
B 0.57
B 0.63
B 0.71
B 0.81
B 0.92
B 1.03
B 1.16
B 1.30
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B14
B 15.5
B 17.5
B 19.5
B22
15.5-18.0 . . . . . . . . B 25
Following Selections for Size 1 Only
. . . . 11.2-12.3 . . . . B 17.5
. . . . 12.4-13.7 11.4-12.1 B 19.5
. . . . 13.8-15.4 12.2-13.7 B22
15.5-17.2 15.5-17.2 13.8-15.2 B25
17.3-19.4 17.3-19.4 15.3-17.2 B 28.0
19.5-21.7 19.5-2.17 17.3-18.9 B32
21.8-23.9 21.8-23.9 19.0-21.4 B36
24.0-26.0 24.0-26.0 21.5-23.7 B40
. . . . . . . . 23.8-26.0 B45
Table 18
Motor
Full-Load Current (Amp)
1.T.U. 2 T.U. 3 T.U.
15.5-16.4
16.5-17.6
17.7-19.1
19.2-20.4
20.5-22.1
22.2-23.4
23.5-25.6
25.7-27.3
27.4-29.4
29.5-31.5
31.6-33.7
33.8-36.5
36.6-39.1
39.2-41.7
41.8-44.8
44.9-48.0
48.1-50.7
50.8-54.9
55.0-59.9
60.0-63.3
63.4-67.2
67.3-72.4
72.5-74.9
75.0-77.4
77.5-80.7
80.8-83.1
83.2-86.0
. . . .
. . . .
14.4-15.3
15.4-16.4
16.5-18.4
18.5-19.6
19.7-21.0
21.1-22.7
22.8-24.2
24.3-25.9
26.0-27.8
27.9-29.8
29.9-31.7
31.8-34.2
34.3-36.9
37.0-39.8
39.9-42.3
42.4-45.3
45.4-47.9
48.0-51.9
52.0-56.5
56.6-60.7
60.8-64.8
64.9-67.1
67.2-70.1
70.2-72.9
73.0-74.9
75.0-77.9
78.0-80.9
81.0-82.9
83.0-86.0
13.6-14.5
14.6-15.5
15.6-17.4
17.5-18.5
18.6-19.9
20.0-21.5
21.6-22.9
23.0-24.5
24.6-26.3
26.4-28.2
28.3-30.0
30.1-32.3
32.4-34.9
35.0-37.6
37.7-40.0
40.1-42.8
42.9-45.3
45.4-49.1
49.2-53.4
53.5-57.4
57.5-61.3
61.4-63.5
63.6-66.3
66.4-69.0
69.1-70.9
71.0-73.7
73.8-76.5
76.6-78.4
78.5-86.0
Thermal
Unit
Number
CC 20.9
CC 22.8
CC 24.6
CC 26.3
CC 28.8
CC 31.0
CC 33.3
CC 36.4
CC 39.6
CC 42.7
CC 46.6
CC 50.1
CC 54.5
CC 59.4
CC 64.3
CC 68.5
CC 74.6
CC 81.5
CC 87.7
CC 94.0
CC 103
CC 112
CC 121
CC 132
CC 143
CC 156
CC 167
CC 180
CC 196
27

Thermal Unit Selection
Tables 19 thru 30
28
Table 19
Motor
Full-Load
Current
(Amp)
43.6-47.3
47.4-51.3
51.4-54.6
54.7-59.7
59.8-65.1
65.2-70.1
70.2-75.1
75.2-82.2
82.3-89.2
89.3-96.5
96.6-104.
105.-113.
114.-123.
124.-133.
Table 23
Thermal
Unit
Number
CC 54.5
CC 59.4
CC 64.3
CC 68.5
CC 74.6
CC 81.5
CC 87.7
CC 94.0
CC 103
CC 112
CC 121
CC 132
CC 143
CC 156
Moter
Full-Load
Current (Amp) Thermal
2 or 3 T.U.
Unit
Number
Large
Enclosure Small
Enclosure
0.31-0.32
0.33-0.36
0.37-0.39
0.40-0.43
0.44-0.47
0.48-0.52
0.53-0.58
0.59-0.60
0.61-0.62
0.63-0.69
0.70-0.76
0.77-0.84
0.85-0.93
0.94-1.03
1.04-1.23
1.24-1.35
1.36-1.47
1.48-1.61
1.62-1.76
1.77-1.93
1.94-2.12
2.13-2.35
2.36-2.61
2.62-2.79
2.80-3.14
3.15-3.48
3.49-3.89
3.90-4.30
4.31-4.73
4.74-5.20
5.21-5.95
5.96-6.49
6.50-7.08
7.09-7.77
7.78-8.48
8.49-9.15
9.16-10.3
10.4-11.9
12.0-13.4
13.5-15.4
15.5-17.5
17.6-19.8
19.9-22.5
22.6-26.0
. . . .
0.29-0.30
0.31-0.33
0.34-0.37
0.38-0.41
0.42-0.45
0.46-0.50
0.51-0.55
0.56-0.57
0.58-0.60
0.61-0.66
0.67-0.73
0.74-0.81
0.82-0.90
0.91-0.99
1.00-1.18
1.19-1.30
1.31-1.42
1.43-1.49
1.50-1.69
1.70-1.85
1.86-2.03
2.04-2.25
2.26-2.50
2.51-2.68
2.69-3.01
3.02-3.35
3.36-3.74
3.75-4.14
4.15-4.57
4.58-5.03
5.04-5.76
5.77-6.29
6.30-6.87
6.88-7.54
7.55-8.25
8.26-8.60
8.61-9.63
9.64-11.1
11.2-12.5
12.6-14.3
14.4-16.1
16.2-18.2
18.3-20.6
20.7-23.4
23.5-26.0
AR .45
AR .49
AR .54
AR .59
AR .65
AR .71
AR .78
AR .86
AR .95
AR 1.05
AR 1.15
AR 1.26
AR 1.39
AR 1.53
AR 1.68
AR 1.85
AR 2.04
AR 2.24
AR 2.46
AR 2.71
AR 2.98
AR 3.28
AR 3.62
AR 3.98
AR 4.37
AR 4.80
AR 5.3
AR 5.8
AR 6.4
AR 7.0
AR 7.7
AR 8.5
AR 9.3
AR 10.2
AR 11.2
AR 12.4
AR 13.6
AR 15.4
AR 17.6
AR 20.5
AR 23
AR 27
AR 30
AR 35
AR 40
Table 20
Motor
Full-Load
Current
(Amp)
133.-148.
149.-174.
175.-195.
196.-219.
220.-239.
240.-271.
272.-308.
309.-348.
349.-397.
398.-429.
430.-495.
496.-520.
Table 24
Motor
Full-Load
Current
(Amp)
88.2-95.1
95.2-1.10
102.-111.
112.-119.
120.-131.
132.-149.
150.-170.
171.-180.
181.-197.
198.-204.
205.-213.
214.-237.
238.-243.
244.-266.
Table 27
Motor Full-Load
Current (Amp)
2 or 3 T.U.
Thermal
Unit
Number
B 1.30
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
Thermal
Unit
Number
DD 112
DD 121
DD 128
DD 140
DD 150
DD 160
DD 185
DD 220
DD 240
DD 250
DD 265
DD 280
DD 300
DD 320
Large
Enclosure Small
Enclosure
4.32-4.93
4.94-5.40
5.41-5.95
5.96-6.13
6.14-6.81
6.82-7.84
7.85-8.97
8.98-10.1
10.2-11.6
11.7-13.2
13.3-15.0
15.1-17.1
17.2-19.6
19.7-21.9
22.0-23.8
23.9-25.6
25.7-27.9
28.0-30.5
30.6-33.0
33.1-35.7
35.8-39.5
39.6-41.5
41.6-45.0
. . . .
4.14-4.71
4.72-5.18
5.19-5.74
5.75-5.98
5.99-6.47
6.48-7.42
7.43-8.46
8.47-9.56
9.57-10.9
11.0-12.3
12.4-14.0
14.1-15.9
16.0-18.1
18.2-20.3
20.4-22.0
22.1-23.6
23.7-25.5
25.6-27.8
27.9-30.0
30.1-32.4
32.5-35.7
35.8-38.3
38.4-40.9
41.6-45.0
Thermal
Unit
Number
AR 8.5
AR 9.3
AR 10.2
AR 11.2
AR 12.4
AR 13.6
AR 15.4
AR 17.6
AR 20.5
AR 23
AR 27
AR 30
AR 35
AR 40
AR 44
AR 47
AR 51
AR 55
AR 60
AR 66
AR 72
AR 79
AR 86
AR 94
© 1998 Square D All Rights Reserved
Table 21
Motor
Full-Load
Current
(Amp)
128.140.
141.-163.
164.-179
1.80-201.
202.-227.
228.-251.
252.-278.
279.-308.
309.-346.
347.-380.
381.-426.
427.-454.
455.-489.
490.-520.
Table 25
Motor
Full-Load
Current
(Amp)
0.28-0.30
0.31-0.33
0.34-0.36
0.37-0.39
0.40-0.42
0.43-0.46
0.47-0.50
0.51-0.52
0.53-0.56
0.57-0.60
0.61-0.66
0.67-0.73
0.74-0.81
0.82-0.90
0.91-1.05
10.6-1.15
1.16-1.25
1.26-1.35
1.36-1.47
1.48-1.56
1.59-1.74
1.75-1.94
1.95-2.20
2.21-2.47
2.48-2.96
2.77-3.07
3.08-3.45
3.46-3.81
3.46-3.81
3.82-4.20
4.21-4.65
4.66-5.29
5.30-5.84
5.85-6.27
6.28-7.00
Table 28
Motor Full-Load
Current (Amp)
2 or 3 T.U.
Thermal
Unit
Load
B 1.30
B 1.45
B 1.67
B 1.88
B 2.01
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
B 5.50
B 6.25
Thermal
Unit
Number
AR .45
AR .49
AR .54
AR .59
AR .65
AR .71
AR .78
AR .86
AR .95
AR 1.05
AR 1.15
AR 1.26
AR 1.39
AR 1.53
AR 1.68
AR 1.85
AR 2.04
AR 2.24
AR 2.46
AR 2.71
AR 2.98
AR 3.28
AR 3.62
AR 3.98
AR 4.37
AR 4.80
AR 5.3
AR 5.3
AR 5.8
AR 6.4
AR 7.0
AR 7.7
AR 8.5
AR 9.3
AR 10.2
Large
Enclosure Small
Enclosure
45.3-48.2
48.3-52.4
52.5-56.4
56.5-61.2
61.3-66.1
66.2-71.4
71.5-77.0
77.1-80.7
80.8-87.7
87.8-94.9
95.0-102.
103.-110.
111.-117.
118.-133.
. . . .
40.3-42.8
42.9-46.2
46.3-49.8
49.9-54.9
55.0-57.9
58.0-62.5
62.6-67.3
67.4-73.4
73.5-78.9
79.0-84.9
85.0-91.0
91.1-97.2
97.3-104.
105.-121.
122.-133.
Thermal
Unit
Number
CC 64.3
CC 68.5
CC 74.6
CC 81.5
CC 87.7
CC 94.0
CC 103
CC 112
CC 121
CC 132
CC 143
CC 156
CC 167
CC 180
CC 196
Table 22
Motor
Full-Load
Current
(Amp)
92.0-100.
101.-109.
110.-119.
120.-131.
132.-139.
140.-156.
157.-166.
167.-180.
181.-189.
190.-209.
210.-225.
226.-238.
239.-266.
Table 26
Thermal
Unit
Number
DD 112
DD 121
DD 128
DD 140
DD 150
DD 160
DD 185
DD 213
DD 220
DD 230
DD 250
DD 265
DD 280
Size 7 Size 8
Type J Type K
Current Transformer Thermal
Ratio
Unit
120/5
Motor Full-
2000/5
Number
Load Current
166.-187. 277.-312. B 1.03
188.-211. 313.-352. B 1.16
212.-232. 353.-388. B 1.30
233.-267. 389.-445. B 1.45
268.-301. 446.-503. B 1.67
302.-336. 504.-561. B 1.88
337.-383. 562.-640. B 2.10
384.-425. 641.-708. B 2.40
426.-466. 709.-777. B 2.65
467.-522. 778.-870. B 3.00
523.-587. 871.-978. B 3.30
588.-656. 979.-1093. B 3.70
657.-764. 1094.-1215. B 4.15
Table 29
Motor Full-Load
Current
50.0-55.9
56.0-60.9
61.0-65.9
66.0-69.9
70.0-75.9
76.0-81.9
82.0-86.9
87.0-92.9
93.0-97.9
98.0-107.9
108.0-113.9
114.0-125.9
Table 30
Motor Full-Load
Current (Amp)
Large
Enclosure Small
Enclosure
39.0-42.9
43.0-48.0
48.1-54.7
54.8-62.2
62.3-71.3
71.4-76.0
76.1-85.5
85.6-92.4
92.4-103.
104.-111.
112.-123.
124.-133.
37.0-40.8
40.9-45.6
45.7-51.8
51.9-58.8
58.9-67.4
67.5-70.4
70.5-79.4
79.5-86.3
86.4-96.7
96.8-105.
106.-117.
118.-133.
5/98
Thermal
Unit
Number
E 88
E 89
E 91
E 92
E 93
E 94
E 96
E 97
E 98
E 99
E 101
E 102
Thermal
Unit
Number
AU 44
AU 50
AU 56
AU 64
AU 72
AU 81
AU 88
AU 99
AU 110
AU 123
AU 135
AU 152

5/98
Table 31
Motor
Full-Load
Current (Amp)
0.31-0.35
0.36-0.39
0.40-0.44
0.45-0.50
0.51-0.61
0.62-0.68
0.69-0.73
0.74-0.82
0.83-0.92
0.93-1.03
1.04-1.19
1.20-1.34
1.35-1.50
1.51-1.74
1.75-1.97
1.98-2.14
2.15-2.47
2.48-2.91
2.92-3.31
3.32-3.75
3.76-4.05
4.06-4.94
4.95-5.52
5.53-6.11
6.12-6.52
6.53-7.31
7.32-8.43
8.44-9.83
9.84-10.7
10.8-11.6
11.7-12.9
13.0-14.3
14.4-15.7
15.8-17.8
17.9-20.3
20.4-23.3
23.4-26.6
26.7-30.3
30.4-35.3
35.4-41.5
41.6-45
Table 35
Motor Full-Load
Current (Amp)
2 T.U. 3 T.U.
36.3-39.9
40.0-44.1
44.2-50.0
50.1-56.4
56.5-64.4
64.5-68.4
68.5-77.7
77.8-84.2
84.3-94.8
94.9-101.
102.-115.
116.-122.
123.-133.
. . . .
Table 38
Motor
Full-Load
Current (Amp)
85.0-95.
96.0-108.
109.-127.
128.-136.
137.-147.
148.-162.
163.-185.
186.-202.
203.-219.
220.-233.
234.-266.
Thermal
Unit
Number
B 0.44
B 0.51
B 0.57
B 0.63
B 0.71
B 0.81
B 0.92
B 1.03
B 1.16
B 1.30
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B 14
B 15.5
B 17.5
B 19.5
B 22
B 25
B 28.0
B 32
B 36
B 40
B 45
B 50
34.7-37.1
37.2-41.5
41.6-47.1
47.2-53.4
53.5-60.7
60.8-64.9
65.0-73.4
73.5-79.5
79.6-89.0
89.1-96.9
97.0-108.
109.-115.
116.-120.
121.-133.
Thermal
Unit
Number
AF 123
AF 135
AF 150
AF 159
AF 168
AF 188
AF 205
AF 220
AF 240
AF 260
AF 308
Thermal
Unit
Number
AU 44
AU 50
AU 56
AU 64
AU 72
AU 81
AU 88
AU 99
AU 110
AU 123
AU 135
AU 152
AU 169
AU 183
Table 32
Motor
Full-Load
Current (Amp)
0.33-0.35
0.36-0.39
0.40-0.42
0.43-0.46
0.47-0.51
0.52-0.56
0.57-0.62
0.63-0.68
0.69-0.75
0.76-0.83
0.84-0.91
0.92-1.00
1.01-1.10
1.11-1.21
1.22-1.33
1.34-1.47
1.48-1.62
1.62-1.77
1.78-1.96
1.97-2.16
2.17-2.37
2.38-2.62
2.63-2.88
2.89-3.17
3.18-3.48
3.49-3.83
3.84-4.20
4.21-4.62
4.63-5.08
5.09-5.57
5.58-6.13
6.14-6.83
6.84-7.41
7.42-8.05
8.06-8.98
8.99-9.93
9.94-10.9
11.0-12.4
12.5-14.3
14.4-15.8
15.9-17.9
18.0-20.0
20.1-22.4
22.5-25.0
Table 36
Motor
Full-Load
Current (Amp)
90.6-97.4
97.5-111.
112.-129.
130.-149.
150.-163.
164.-189.
190-213.
214.-240.
241.-266.
Table 39
Motor
Full-Load
Current (Amp)
148.-173.
174.-189.
190.-205.
206.-222.
223.-243.
244.-261.
262.-289.
290.-324.
325.-367.
368.-389.
390.-404.
405.-451.
452.-495.
496.-520.
Thermal
Unit
Number
AR .45
AR .49
AR .54
AR .59
AR .65
AR .71
AR .78
AR .86
AR .95
AR 1.05
AR 1.15
AR 1.26
AR 1.39
AR 1.53
AR 1.68
AR 1.85
AR 2.04
AR 2.24
AR 2.46
AR 2.71
AR 2.98
AR 3.28
AR 3.62
AR 3.98
AR 4.37
AR 4.80
AR 5.3
AR 5.8
AR 6.4
AR 7.0
AR 7.7
AR 8.5
AR 9.3
AR 10.2
AR 11.2
AR 12.4
AR 13.6
AR 15.4
AR 17.6
AR 20.5
AR 23
AR 27
AR 30
AR 35
Thermal
Unit
Number
AF 110
AF 123
AF 135
AF 150
AF 159
AF 168
AF 188
AF 205
AF 220
Thermal
Unit
Number
AR 1.68
AR 1.85
AR 2.04
AR 2.24
AR 2.46
AR 2.71
AR 2.98
AR 3.28
AR 3.62
AR 3.98
AR 4.37
AR 4.80
AR 5.3
AR 5.8
© 1998 Square D All Rights Reserved
Table 33
Motor
Full-Load
Current (Amp)
0.28-0.30
0.31-0.33
0.34-0.36
0.37-0.39
0.40-0.42
0.52-0.56
0.57-0.62
0.63-0.68
0.69-0.75
0.76-0.83
0.61-0.66
0.67-0.73
0.74-0.81
0.82-0.90
0.91-1.05
1.06-1.15
1.16-1.25
1.26-1.35
1.36-1.47
1.48-1.58
1.59-1.74
1.75-1.94
1.95-2.20
2.21-2.47
2.48-2.76
2.77-3.07
3.08-3.45
3.46-3.81
3.82-4.20
4.21-4.65
4.66-5.29
5.30-5.84
5.85-6.27
6.28-6.97
6.98-7.59
7.60-7.89
7.90-8.95
8.96-10.3
10.4-11.7
11.8-12.0
Following Selections
for Size 1 Only
11.8-13.3
13.4-15.2
15.3-17.2
17.3-19.7
19.8-22.4
22.5-26.0
Table 40
Motor
Full-Load
Current (Amp)
15.3-16.7
16.8-19.8
19.9-22.8
22.9-25.8
25.9-30.4
30.5-31.9
32.0-34.2
34.3-38.8
38.9-44.2
44.3-50.2
50.3-57.1
57.2-63.2
63.3-68.6
68.7-78.6
78.7-86.0
Thermal
Unit
Number
AR .45
AR .49
AR .54
AR .59
AR .65
AR .71
AR .78
AR .86
AR .95
AR 1.05
AR 1.15
AR 1.26
AR 1.39
AR 1.53
AR 1.68
AR 1.85
AR 2.04
AR 2.24
AR 2.46
AR 2.71
AR 2.98
AR 3.28
AR 3.62
AR 3.98
AR 4.37
AR 4.80
AR 5.3
AR 5.8
AR 6.4
AR 7.0
AR 7.7
AR 8.5
AR 9.3
AR 10.2
AR 11.2
AR 12.4
AR 13.6
AR 15.4
AR 17.6
AR 20.5
AR 20.5
AR 23
AR 27
AR 30
AR 35
AR 40
Thermal
Unit
Number
C 20
C 22
C 26
C 30
C 34
C 40
C 42
C 45
C 51
C 58
C 66
C 75
C 83
C 90
C 103
Thermal Unit Selection
Tables 31 thru 41
Table 34
Motor
Full-Load
Current (Amp)
15.1-16.2
16.3-17.5
17.6-19.1
19.2-20.7
20.8-22.2
22.3-24.0
24.1-25.7
25.8-27.8
27.9-30.1
30.2-32.5
32.6-35.1
35.2-38.0
38.1-41.1
41.2-44.0
44.1-47.2
47.3-51.1
51.2-55.8
55.9-59.5
59.6-64.5
64.6-69.5
69.6-75.0
75.1-78.1
78.2-82.3
82.4-86.0
Table 37
Motor
Full-Load
Current (Amp)
27.1-30.0
30.1-33.2
33.3-35.7
35.8-39.4
39.5-43.4
43.5-46.9
47.0-51.5
51.6-57.0
57.1-62.8
62.9-69.1
69.2-75.0
75.1-83.3
Table 41
Motor
Full-Load
Current (Amp)
0.81-0.92
0.93-1.07
1.08-1.14
1.15-1.26
1.27-1.49
1.50-1.73
1.74-1.89
1.90-2.16
2.17-2.37
2.38-2.66
2.67-2.99
3.00-3.40
3.41-3.94
3.95-4.15
4.16-4.49
4.50-5.15
5.16-5.77
5.78-6.61
6.62-7.14
7.15-7.97
7.98-8.15
8.15-9.32
9.33-9.97
9.98-10.7
10.8-12.0
12.1-13.9
14.0-15.7
15.8-18.4
18.5-21.6
21.7-24.0
24.1-28.6
28.7-30.7
30.8-33.5
33.6-36.0
Thermal
Unit
Number
CC 20.9
CC 22.8
CC 24.6
CC 26.3
CC28.8
CC 31.0
CC 33.3
CC 36.4
CC 39.6
CC 42.7
CC 46.6
CC 50.1
CC 54.5
CC 59.4
CC 64.3
CC 68.5
CC 74.6
CC 81.5
CC 87.7
CC 94.0
CC 103
CC 112
CC 121
CC 132
Thermal
Unit
Number
E 67
E 69
E 70
E 71
E 72
E 73
E 74
E 76
E 77
E 78
E 79
E 80
Thermal
Unit
Number
B 1.16
B 1.30
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B 14
B 15.5
B 17.5
B 19.5
B 22
B 25
B 28.0
B 32
B 36
B 40
B 45
B 56
29

Thermal Unit Selection
Tables 42 thru 52
30
Table 42
Motor
Full-Load
Current (Amp)
0.28-0.30
0.31-0.33
0.34-0.36
0.37-0.39
0.40-0.42
0.43-0.46
0.47-0.50
0.51-0.52
0.53-0.56
0.57-0.60
0.61-0.66
0.67-0.73
0.74-0.81
0.82-0.90
0.91-1.05
1.06-1.15
1.16-1.25
1.26-1.35
1.36-1.47
1.48-1.58
1.59-1.74
1.75-1.94
1.95-2.20
2.21-2.47
2.48-2.76
2.77-3.07
3.08-3.45
3.46-3.81
3.82-4.20
4.21-4.65
4.66-5.29
5.30-5.84
5.85-6.27
6.28-6.97
6.98-7.59
7.60-7.89
7.90-8.95
8.96-10.3
10.4-11.7
11.8-13.3
13.4-15.2
15.3-17.2
17.3-19.7
19.8-22.4
22.5-26.0
Table 49
Motor
Full-Load
Current (Amp)
82.5-88.2
88.3-95.9
96.0-102.
103.-109.
110.-121.
122.-139.
140.-154.
155.-163.
164.-175.
176.-184.
185.-195.
196.-215.
216.-224.
225.-243.
244.-266.
Thermal
Unit
Number
AR .45
AR .49
AR .54
AR .59
AR .65
AR .71
AR .78
AR .86
AR .95
AR 1.05
AR 1.15
AR 1.26
AR 1.39
AR 1.53
AR 1.68
AR 1.85
AR 2.04
AR 2.24
AR 2.46
AR 2.71
AR 2.98
AR 3.28
AR 3.62
AR 3.98
AR 4.37
AR 4.80
AR 5.3
AR 5.8
AR 6.4
AR 7.0
AR 7.7
AR 8.5
AR 9.3
AR 10.2
AR 11.2
AR 12.4
AR 13.6
AR 15.4
AR 17.6
AR 20.5
AR 23
AR 27
AR 30
AR 35
AR 40
Thermal
Unit
Number
DD 112
DD 121
DD 128
DD 140
DD 150
DD 160
DD 185
DD 220
DD 240
DD 250
DD 265
DD 280
DD 300
DD 320
DD 340
Table 43
Motor
Full-Load
Current (Amp.)
0.41-0.44
0.45-0.49
0.50-0.53
0.54-0.58
0.59-0.65
0.66-0.71
0.72-0.78
0.79-0.85
0.86-0.96
0.97-1.04
1.05-1.16
1.17-1.29
1.30-1.37
1.38-1.47
1.48-1.56
1.57-1.65
1.66-1.79
1.80-1.95
1.96-2.15
2.16-2.38
2.39-2.75
2.76-2.84
2.85-3.06
3.07-3.45
3.46-3.70
3.71-4.07
4.08-4.32
4.33-4.90
4.91-5.35
5.36-5.85
5.86-6.41
6.42-6.79
6.80-7.57
7.58-8.15
8.16-8.98
8.99-9.67
9.68-9.95
9.96-10.8
10.9-12.1
12.2-13.1
13.2-13.9
14.0-15.0
15.1-16.0
Table 46
Motor
Full-Load
Current (Amp)
105.-116.
117.-132.
133.-148.
149.-165.
166.-184.
185.-207.
208.-229.
230.-266.
Table 50
Motor
Full-Load
Current (Amp)
14.4-16.1
16.2-18.6
18.7-20.5
20.6-23.4
23.5-26.9
27.0-28.3
28.4-30.8
30.9-35.0
35.1-38.8
38.9-44.3
44.4-49.3
49.4-55.5
55.6-61.0
61.1-68.6
68.7-76.3
76.4-86.0
Thermal
Unit
Number
A .49
A .54
A .59
A .65
A .71
A .78
A .86
A .95
A 1.02
A 1.16
A 1.25
A 1.39
A 1.54
A 1.63
A 1.75
A 1.86
A 1.99
A 2.15
A 2.31
A 2.57
A 2.81
A 3.61
A 3.95
A 4.32
A 4.79
A 5.30
A 5.78
A 6.20
A 6.99
A 7.65
A 8.38
A 9.25
A 9.85
A 11.0
A 11.9
A 13.2
A 14.1
A 14.8
A 16.2
A 17.9
A 19.8
A 21.3
A 25.2
Thermal
Unit
Number
AR 3.28
AR 3.62
AR 3.98
AR 4.37
AR 4.80
AR 5.3
AR 5.8
AR 6.4
Thermal
Unit
Number
AU 20
AU 23
AU 26
AU 29
AU 33
AU 38
AU 40
AU 44
AU 50
AU 56
AU 64
AU 72
AU 81
AU 88
AU 99
AU 110
© 1998 Square D All Rights Reserved
Table 44
Motor
Full-Load
Current (Amp)
0.34-0.38
0.39-0.43
0.44-0.48
0.49-0.53
0.54-0.62
0.63-0.69
0.70-0.78
0.79-0.88
0.89-0.99
1.00-1.10
1.11-1.26
1.27-1.43
1.44-1.59
1.60-1.81
1.82-2.00
2.01-2.28
2.29-2.52
2.53-2.87
2.88-3.28
3.29-3.75
3.76-4.27
4.28-4.77
4.78-5.27
5.28-5.91
5.92-6.25
6.26-6.83
6.84-7.65
7.66-8.55
8.56-9.56
9.57-10.3
10.4-11.3
11.4-12.4
12.5-14.1
14.2-15.7
15.8-17.9
18.0-20.1
20.2-22.5
22.6-25.0
Table 47
Motor
Full-Load
Current (Amp)
146.-169.
170.-185.
186.-201.
202.-217.
218.-236.
237.-253.
254.-279.
280.-311.
312.-353.
354.-396.
397.-442.
443.-492.
493.-520.
Table 51
Motor
Full-Load
Current (Amp)
15.7-17.7
17.8-19.9
20.0-22.7
22.8-25.7
25.8-29.1
29.2-30.8
30.9-34.3
34.4-38.3
38.4-42.3
42.4-47.5
47.6-53.0
53.1-60.5
60.6-64.9
65.0-71.5
71.6-77.3
Thermal
Unit
Number
B 0.44
B 0.51
B 0.57
B 0.65
B 0.71
B 0.81
B 0.92
B 1.03
B 1.16
B 1.30
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B 14
B 15.5
B 17.5
B 19.5
B 22
B 25
B 28.0
B 32
Thermal
Unit
Number
AR 1.68
AR 1.85
AR 2.04
AR 2.24
AR 2.46
AR 2.71
AR 2.98
AR 3.28
AR 3.62
AR 3.98
AR 4.37
AR 4.80
AR 5.3
Thermal
Unit
Number
AU 20
AU 23
AU 26
AU 29
AU 33
AU 38
AU 40
AU 44
AU 50
AU 56
AU 64
AU 72
AU 81
AU 88
AU 99
77.4-86.0 AU 110
Table 45
Size 7 Size 8
Type J Type K
Current Transformer
Ratio
Thermal
Unit
1200/5
Motor Full-
2000/5 Number
Load Current
Non-Compensated
136.-150. 227.-251. AR 1.05
151.-165. 252.-276. AR 1.15
166.-183. 277.-305. AR 1.26
184.-202. 306.-337. AR 1.39
203.-224. 338.-373. AR 1.53
225.-267. 374.-445. AR 1.68
268.-293. 446.-489. AR 1.85
294.-319. 490.-532. AR 2.04
320.-349. 533.-582. AR 2.24
350.-381. 583.-636. AR 2.46
382.-418. 637.-697. AR 2.71
419.-459. 698.-766. AR 2.98
460.-509. 767.-849. AR 3.28
510.-565. 850.-942. AR 3.62
566.-604. 943.-1007. AR 3.98
605.-697.
698.-753. 1008.-1133. AR 4.37
.......... AR 4.80
Compensated
161.-177. 268.-295. AR 1.26
178.-196. 296.-327. AR 1.39
197.-217. 328.-363. AR 1.53
218.-253. 364.-423. AR 1.68
254.-277. 424.-463. AR 1.85
278.-301. 464.-503. AR 2.04
302.-325. 504.-543. AR 2.24
326.-354. 544.-592. AR 2.46
355.-381. 592.-635. AR 2.71
382.-419. 636.-699. AR 2.98
420.-467. 700.-779. AR 3.28
468.-529. 780.-883. AR 3.62
530.-594. 884.-991. AR 3.98
595.-664. 992.-1107. AR 4.37
665.-738. 1108.-1231. AR 4.80
739.-829. .......... AR 5.3
Table 48
Motor
Full-Load
Current (Amp)
158.-187.
188.-206.
207.-224.
225.-244.
245.-267.
268.-289.
290.-324.
325.-361.
362.-406.
407.-445.
446.-463.
464.-520.
Table 52
Motor
Full-Load
Current (Amp)
92.0-103.
104.-116.
117.-139.
140.-150.
151.-167.
168.-177.
178.-205.
206.-222.
223.-232.
233.-247.
Thermal
Unit
Number
AR 1.68
AR 1.85
AR 2.04
AR 2.24
AR 2.46
AR 2.71
AR 2.98
AR 3.28
AR 3.62
AR 3.98
AR 4.37
AR 4.80
Thermal
Unit
Number
AF 123
AF 135
AF 150
AF 159
AF 168
AF 188
AF 205
AF 220
AF 240
AF 260
248.-266. AF 308
5/98

5/98
Table 53
Motor Full-Load
Current (Amp)
1 T. U. 3 T. U.
0.31-0.33
0.34-0.36
0.37-0.40
0.41-0.48
0.49-0.57
0.58-0.64
0.65-0.70
0.71-0.77
0.78-0.85
0.86-0.99
1.00-1.10
1.11-1.28
1.29-1.14
1.42-1.58
1.59-1.80
1.81-2.03
2.04-2.25
2.26-2.51
2.52-2.83
2.84-3.29
3.30-3.75
3.76-4.22
4.23-4.65
4.66-5.16
5.17-5.53
5.54-6.09
6.10-6.80
6.81-7.60
7.61-8.35
8.36-9.00
Table 57
Motor Full-Load
Current (Amp)
0.29-0.31
0.32-0.36
0.37-0.38
0.39-0.46
0.47-0.55
0.56-0.61
0.62-0.66
0.67-0.75
0.76-0.83
0.84-0.93
0.94-1.06
1.07-1.18
1.19-1.31
1.32-1.47
1.48-1.67
1.68-1.83
1.84-2.04
2.05-2.38
2.39-2.60
2.61-3.13
3.14-3.59
3.60-3.94
3.95-4.19
4.20-4.72
4.73-5.21
5.22-5.51
5.52-6.17
6.18-7.00
....
....
2 T. U. 3 T. U.
5.09-5.59
5.60-6.11
6.12-6.72
6.73-7.37
7.38-7.67
7.68-8.68
8.69-9.94
9.95-11.1
11.2-12.9
13.0-14.7
14.8-16.9
17.0-19.2
19.3-21.9
22.0-24.4
24.5-26.3
26.4-28.0
28.1-30.3
30.4-32.2
32.3-34.4
34.5-36.6
36.7-39.5
39.6-45.0
....
Table 61
Motor Full-Load
Current (Amp)
5.15-5.97
5.98-6.50
6.51-7.04
7.05-7.59
7.60-7.93
7.94-9.04
9.05-10.2
10.3-11.5
11.6-13.2
13.3-14.9
15.0-16.9
17.0-19.3
19.4-21.7
21.8-25.0
25.1-27.0
27.1-29.1
29.2-30.8
30.9-32.9
33.0-35.0
35.1-37.1
37.2-39.1
39.2-41.5
41.6-45.0
2 T. U. 3 T. U.
46.8-50.0
50.1-54.2
54.3-58.3
58.4-63.6
63.7-68.5
68.6-74.0
74.1-79.8
79.9-83.0
83.1-88.9
89.0-95.6
95.7-102.
103.-109.
110.-119.
120.-133.
....
45.3-48.2
48.3-52.4
52.5-56.4
56.5-61.2
61.3-66.1
66.2-71.4
71.5-77.0
77.1-79.0
79.1-84.7
84.8-91.1
91.2-98.1
98.2-104.
105.-113.
114.-123.
124.-133.
Thermal
Unit
Number
B 0.44
B 0.51
B 0.57
B 0.63
B 0.71
B 0.81
B 0.92
B 1.03
B 1.16
B 1.30
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
Thermal
Unit
Number
AR 8.5
AR 9.3
AR 10.2
AR 11.2
AR 12.4
AR 13.6
AR 15.4
AR 17.6
AR 20.5
AR 23
AR 27
AR 30
AR 35
AR 40
AR 44
AR 47
AR 51
AR 55
AR 60
AR 66
AR 72
AR 79
AR 86
Thermal
Unit
Number
CC 64.3
CC 68.5
CC 74.6
CC 81.5
CC 87.7
CC 94.0
CC 103
CC 112
CC 121
CC 132
CC 143
CC 156
CC 167
CC 180
CC 196
Table 54
Motor Full-Load
Current (Amp)
2 T. U. 3 T. U.
43.6-45.5
45.6-49.6
49.7-53.1
53.2-57.6
57.7-62.4
62.5-67.5
67.6-71.1
71.2-75.9
76.0-81.9
82.0-84.6
84.7-90.7
90.8-98.4
98.5-105.
106.-117.
118.-123.
124.-133.
....
Table 58
Motor Full-Load
Current (Amp)
41.1-43.5
43.6-46.8
46.9-50.0
50.1-54.9
55.0-57.5
57.6-61.8
61.9-66.2
66.3-72.4
72.5-78.1
78.2-80.7
80.8-86.5
86.6-93.9
94.0-100.
101.-112.
113.-117.
118.-123.
124.-133.
1 or 2 T. U. 3 T. U.
3.37-3.82
3.83-4.33
4.34-4.79
4.80-5.33
5.34-5.79
5.80-6.27
6.28-7.03
7.04-7.88
7.89-8.73
8.74-9.55
9.56-10.6
10.7-11.8
11.9-13.1
13.2-14.9
15.0-16.9
17.0-18.8
18.9-21.5
21.6-24.1
24.2-26.8
26.9-29.9
30.0-35.5
35.6-36.5
36.6-39.6
39.7-41.5
41.6-45.0
3.28-3.51
3.52-3.89
3.90-4.14
4.15-4.73
4.74-5.22
5.23-5.53
5.54-6.21
6.22-7.17
7.18-8.19
8.20-8.90
8.91-9.57
9.58-10.6
10.7-11.8
11.9-12.7
12.8-14.4
14.5-16.1
16.2-18.2
18.3-20.2
20.3-22.8
22.9-25.6
25.7-28.8
28.9-30.6
30.7-32.4
32.5-34.6
34.7-38.6
Thermal
Unit
Number
CC 64.3
CC 68.5
CC 74.6
CC 81.5
CC 87.7
CC 94.0
CC 103
CC 112
CC 121
CC 132
CC 143
CC 156
CC 167
CC 180
CC 196
CC 208
CC 219
Thermal
Unit
Number
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B 14
B 15.5
B 17.5
B 19.5
B 22
B 25
B 28.0
B 32
B 36
B 40
B 45
B 50
B 56
B 62
B 70
.... 38.7-45.0 B 79
Table 62
Motor Full-Load
Current (Amp)
2 T. U. 3 T. U.
4.83-5.33
5.34-5.84
5.85-6.43
6.44-7.03
7.04-7.30
7.31-8.29
8.30-9.49
9.50-10.7
10.8-12.3
12.4-14.0
14.1-16.0
16.1-18.4
18.5-21.0
21.1-23.0
23.1-25.5
25.6-26.7
26.8-28.3
28.4-30.3
30.4-32.5
32.6-34.5
34.6-37.6
37.7-39.7
39.8-41.4
41.5-45.0
4.90-5.68
5.69-6.19
6.20-6.71
6.72-7.14
7.15-7.49
7.50-8.48
8.49-9.66
9.67-10.8
10.9-12.4
12.5-13.9
14.0-15.7
15.8-18.1
18.2-20.3
20.4-23.0
23.1-25.2
25.3-26.6
26.7-28.2
28.3-30.2
30.3-32.3
32.4-34.3
34.4-36.7
36.8-36.3
39.4-45.0
....
Thermal
Unit
Number
AR 8.5
AR 9.3
AR 10.2
AR 11.2
AR 12.4
AR 13.6
AR 15.4
AR 17.6
AR 20.5
AR 23
AR 27
AR 30
AR 35
AR 40
AR 44
AR 47
AR 51
AR 55
AR 60
AR 66
AR 72
AR 79
AR 86
AR 94
© 1998 Square D All Rights Reserved
Table 55
Motor Load-Full
Current (Amp)
2 T. U. 3 T. U.
0.38-0.40
0.41-0.43
0.44-0.48
0.49-0.52
0.53-0.56
0.57-0.61
0.62-0.67
0.68-0.73
0.74-0.81
0.82-0.89
0.90-0.97
0.98-1.07
1.08-1.17
1.18-1.31
1.32-1.49
1.50-1.69
1.70-1.83
1.84-2.00
2.01-2.17
2.18-2.35
2.36-2.60
2.61-2.87
2.88-3.14
3.15-3.47
3.48-3.90
3.91-4.36
4.37-4.88
4.89-5.37
5.38-5.97
5.98-6.55
6.56-7.50
7.51-8.23
8.24-9.00
Table 59
Motor Full-Load
Current (Amp)
0.31-0.33
0.34-0.36
0.37-0.39
0.40-0.43
0.44-0.47
0.48-0.51
0.52-0.56
0.57-0.58
0.59-0.64
0.65-0.70
0.71-0.77
0.78-0.85
0.86-0.94
0.95-1.03
1.04-1.22
1.23-1.34
1.35-1.46
1.47-1.58
1.59-1.76
1.77-1.85
1.86-2.08
2.09-2.27
2.28-2.51
2.52-2.90
2.91-3.23
3.24-3.58
3.59-4.02
4.03-4.43
4.44-4.86
4.87-5.37
5.38-6.12
6.13-6.65
6.66-7.00
1 or 2 T. U. 3 T. U.
0.34-0.38
0.39-0.43
0.44-0.47
0.48-0.53
0.54-0.60
0.61-0.68
0.69-0.76
0.77-0.86
0.87-0.97
0.98-1.07
1.08-1.23
1.24-1.39
1.40-1.55
1.56-1.77
1.78-1.96
1.97-2.15
2.16-2.41
2.42-2.71
2.72-3.03
3.04-3.53
3.54-4.01
4.02-4.56
4.57-5.03
5.04-5.59
5.60-5.95
5.96-6.58
6.59-7.31
7.32-8.15
8.16-9.13
9.14-9.91
9.92-10.7
10.8-12.1
12.2-13.5
13.6-15.1
15.2-17.0
17.1-18.9
19.0-21.5
21.6-24.0
24.1-26.0
....
0.29-0.31
0.32-0.35
0.36-0.38
0.39-0.46
0.47-0.55
0.56-0.62
0.63-0.67
0.68-0.75
0.76-0.84
0.85-0.95
0.96-1.09
1.10-1.21
1.22-1.35
1.36-1.53
1.54-1.73
1.74-1.90
1.91-2.14
2.15-2.34
2.35-2.67
2.68-3.22
3.23-3.48
3.49-3.87
3.88-4.14
4.15-4.73
4.74-5.28
5.29-5.64
5.65-6.39
6.40-7.43
7.44-8.55
8.56-9.40
9.41-10.0
10.1-11.2
11.3-12.5
12.6-13.5
13.6-15.4
15.5-17.5
17.6-19.9
20.0-22.2
22.3-25.5
25.6-26.0
Thermal Unit Selection
Tables 53 thru 63
Thermal
Unit
Number
AR .45
AR .49
AR .54
AR .59
AR .65
AR .71
AR .78
AR .86
AR .95
AR 1.05
AR 1.15
AR 1.26
AR 1.39
AR 1.53
AR 1.68
AR 1.85
AR 2.04
AR 2.24
AR 2.46
AR 2.71
AR 2.98
AR 3.28
AR 3.62
AR 3.98
AR 4.37
AR 4.80
AR 5.3
AR 5.8
AR 6.4
AR 7.0
AR 7.7
AR 8.5
AR 9.3
Thermal
Unit
Number
B 0.44
B 0.51
B 0.57
B 0.63
B 0.71
B 0.81
B 0.92
B 1.03
B 1.16
B 1.30
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B 14
B 15.5
B 17.5
B 19.5
B 22
B 25
B 28.0
B 32
B 36
B 40
Table 56
Motor Full-Load
Current (Amp)
1 or 2 T. U. 3 T. U.
3.29-3.74
3.75-4.23
4.24-4.68
4.69-5.22
5.23-5.67
5.68-6.13
6.14-6.91
6.92-7.70
7.71-8.56
8.57-9.39
9.40-10.4
10.5-11.6
11.7-12.9
13.0-14.6
14.7-16.5
16.6-18.5
18.6-21.0
21.1-23.6
23.7-26.3
26.4-29.3
29.4-35.1
35.2-36.1
36.2-39.1
39.2-41.5
41.6-45.0
....
....
Table 60
Motor Full-
Load Current
(Amp)
6.84-7.49
7.50-8.05
8.06-9.10
9.11-9.99
10.0-11.1
11.2-12.7
12.8-14.8
14.9-16.6
16.7-19.3
19.4-21.4
21.5-25.1
25.2-28.3
28.4-31.2
31.3-33.3
33.4-35.7
35.8-38.5
38.6-41.5
41.6-45.0
Table 63
Motor
Full-Load
Current (Amp)
3.18-3.40
3.41-3.76
3.77-4.00
4.01-4.57
4.58-5.03
5.04-5.32
5.33-5.97
5.98-6.88
6.89-7.82
7.83-8.47
8.48-9.15
9.16-10.1
10.2-11.2
11.3-12.0
12.1-13.6
13.7-15.2
15.3-17.1
17.2-19.0
19.1-21.5
21.6-24.1
24.2-27.0
27.1-28.7
28.8-30.4
30.5-32.2
32.3-35.4
35.5-38.2
38.3-45.0
Thermal
Unit
Number
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B 14
B 15.5
B 17.5
B 19.5
B 22
B 25
B 28.0
B 32
B 36
B 40
B 45
B 50
B 56
B 62
B 70
B 79
B 88
Thermal Unit
Number
AR 9.3
AR 10.2
AR 11.2
AR 12.4
AR 13.6
AR 15.4
AR 17.6
AR 20.5
AR 23
AR 27
AR 30
AR 35
AR 40
AR 44
AR 47
AR 51
AR 55
AR 60
Thermal Unit
Number
1 or 2 T. U. 3 T. U.
15.1-17.0
17.1-19.1
19.2-21.8
21.9-24.5
24.6-27.9
28.0-29.5
29.6-32.9
33.0-36.6
36.7-40.3
40.4-45.1
45.2-50.4
50.5-57.3
57.4-62.4
62.5-68.3
68.4-73.9
74.0-80.6
80.7-86.0
AU 20
AU 23
AU 26
AU 29
AU 33
AU 38
AU 40
AU 44
AU 50
AU 56
AU 64
AU 72
AU 81
AU 88
AU 99
AU 110
AU 123
31

Thermal Unit Selection
Tables 64 thru 71
32
Table 64
Motor
Full-Load Current (Amp.)
2 T. U.
1 PH
0.38-0.40
0.41-0.43
0.44-0.48
0.49-0.52
0.53-0.56
0.57-0.61
0.62-0.67
0.68-0.73
0.74-0.81
0.82-0.89
0.90-0.97
0.98-1.07
1.08-1.17
1.18-1.31
1.32-1.49
1.50-1.69
1.70-1.83
1.84-2.00
2.01-2.17
2.18-2.35
2.36-2.60
2.61-2.87
2.88-3.14
3.15-3.47
3.48-3.90
3.91-4.36
4.37-4.88
4.89-5.37
5.38-5.97
5.98-6.55
6.56-7.50
7.51-8.23
8.24-8.99
9.00-9.86
9.87-10.7
10.8-11.2
11.3-12.8
12.9-14.8
14.9-16.7
16.8-18.0
2 T. U.
2 PH
0.38-0.40
0.41-0.43
0.44-0.48
0.49-0.52
0.53-0.56
0.57-0.61
0.62-0.67
0.68-0.73
0.74-0.81
0.82-0.89
0.90-0.97
0.98-1.07
1.08-1.17
1.18-1.31
1.32-1.49
1.50-1.69
1.70-1.83
1.84-2.00
2.01-2.17
2.18-2.35
2.36-2.60
2.61-2.87
2.88-3.14
3.15-3.47
3.48-3.90
3.91-4.36
4.37-4.88
4.89-5.37
5.38-5.97
5.98-6.55
6.56-7.50
7.51-8.23
8.24-8.99
9.00-9.86
9.87-10.7
10.8-11.2
11.3-12.0
....
....
....
3 T. U.
0.31-0.33
0.34-0.36
0.37-0.39
0.40-0.43
0.44-0.47
0.48-0.51
0.52-0.56
0.57-0.58
0.59-0.64
0.65-0.70
0.71-0.77
0.78-0.85
0.86-0.94
0.95-1.03
1.04-1.22
1.23-1.34
1.35-1.46
1.47-1.58
1.59-1.76
1.77-1.85
1.86-2.08
2.09-2.27
2.28-2.51
2.52-2.90
2.91-3.23
3.24-3.58
3.59-4.02
4.03-4.43
4.44-4.86
4.87-5.37
5.38-6.12
6.13-6.65
6.66-7.31
7.32-7.96
7.97-8.69
8.70-8.99
9.00-10.1
10.2-11.5
11.6-12.0
....
Following Selections for Size 1 Only.
....
....
....
16.8-19.0
19.1-22.0
22.1-24.9
25.0-26.0
....
....
Table 68
11.3-12.8
12.9-14.8
14.9-16.7
16.8-19.0
19.1-22.0
22.1-24.9
25.0-26.0
....
....
Motor Full-Load
Current (Amp)
14.9-16.1
16.2-17.3
17.4-19.5
19.6-20.7
20.8-22.4
22.5-23.9
24.0-25.8
25.9-27.6
27.7-29.7
29.8-31.8
31.9-34.2
34.3-37.0
37.1-39.6
39.7-42.5
42.6-45.0
45.1-48.6
48.7-51.2
51.3-56.0
56.1-60.1
60.2-64.3
64.4-68.9
69.0-71.9
72.0-75.4
75.5-78.9
79.0-82.1
....
....
11.6-13.0
13.1-14.6
14.7-16.5
16.6-18.5
18.6-21.0
21.1-23.6
23.7-26.0
Thermal Unit
Number
CC 20.9
CC 22.8
CC 24.6
CC 26.3
CC 28.8
CC 31.0
CC 33.3
CC 36.4
CC 39.6
CC 42.7
CC 46.6
CC 50.1
CC 54.5
CC 59.4
CC 64.3
CC 68.5
CC 74.6
CC 81.5
CC 87.7
CC 94.0
CC 103
CC 112
CC 121
CC 132
CC 143
82.2-86.0 CC 156
Thermal
Unit
Number
AR .45
AR .49
AR .54
AR .59
AR .65
AR .71
AR .78
AR .86
AR .95
AR 1.05
AR 1.15
AR 1.26
AR 1.39
AR 1.53
AR 1.68
AR 1.85
AR 2.04
AR 2.24
AR 2.46
AR 2.71
AR 2.98
AR 3.28
AR 3.62
AR 3.98
AR 4.37
AR 4.80
AR 5.3
AR 5.8
AR 6.4
AR 7.0
AR 7.7
AR 8.5
AR 9.3
AR 10.2
AR 11.2
AR 12.4
AR 13.6
AR 15.4
AR 17.6
AR 20.5
AR 13.6
AR 15.4
AR 17.6
AR 20.5
AR 23
AR 27
AR 30
AR 35
AR 40
Table 69
Table 65
Motor Full-Load
Current (Amp)
0.31-0.35
0.36-0.39
0.40-0.44
0.45-0.50
0.51-0.58
0.59-0.65
0.66-0.73
0.74-0.82
0.83-0.92
0.93-1.03
1.04-1.19
1.20-1.34
1.35-1.50
1.51-1.67
1.68-1.89
1.90-2.14
2.15-2.36
2.37-2.65
2.66-2.97
2.98-3.47
3.48-3.94
3.95-4.44
4.45-4.94
4.95-5.52
5.53-5.88
5.89-6.52
6.53-7.31
7.32-8.21
8.22-9.18
9.19-9.90
10.0-11.0
11.1-12.4
12.5-13.9
14.0-15.7
15.8-17.8
17.9-20.0
20.1-22.9
23.0-25.0
Following Selections
for Size 2 Only.
23.0-25.7
25.8-28.6
28.7-32.2
32.3-35.8
35.9-40.1
40.2-44.4
44.5-50.0
Motor Full-Load
Current (Amp)
1 or 2 T. U. 3 T. U.
3.46-3.90
3.91-4.44
4.45-4.91
4.92-5.51
5.52-5.84
5.85-6.54
6.55-7.33
7.34-8.31
8.32-9.22
9.23-10.0
10.1-11.2
11.3-12.5
12.6-14.2
14.3-16.1
16.2-18.4
18.5-20.5
20.6-23.2
23.3-26.6
26.7-29.6
29.7-33.5
33.6-37.2
37.3-41.5
41.6-45.0
....
3.38-3.65
3.66-4.07
4.08-4.36
4.37-5.19
5.20-5.59
5.60-5.98
5.99-6.78
6.79-7.91
7.92-9.12
9.13-10.0
10.1-10.7
10.8-12.0
12.1-13.5
13.6-14.6
14.7-16.7
16.8-18.9
19.0-21.6
21.7-24.1
24.2-27.6
27.7-31.2
31.3-35.5
35.6-37.8
37.9-41.5
41.6-45.0
Thermal Unit
Number
B 0.44
B 0.51
B 0.57
B 0.63
B 0.71
B 0.81
B 0.92
B 1.03
B 1.16
B 1.30
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B 14
B 15.5
B 17.5
B 19.5
B 22
B 25
B 28.0
B 32
B 32
B 36
B 40
B 45
B 50
B 56
B 62
Thermal
Unit
Number
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B 14
B 15.5
B 17.5
B 19.5
B 22
B 25
B 28.0
B 32
B 36
B 40
B 45
B 50
B 56
B 62
© 1998 Square D All Rights Reserved
Table 66
Motor Full-Load
Current (Amp)
0.31-0.32
0.33-0.36
0.37-0.41
0.42-0.49
0.50-0.54
0.55-0.61
0.62-0.67
0.68-0.76
0.77-0.87
0.88-0.98
0.99-1.05
1.06-1.25
1.26-1.33
1.34-1.56
1.57-1.71
1.72-1.97
1.98-2.15
2.16-2.42
2.43-2.78
2.79-3.28
3.29-3.88
3.89-4.13
4.14-4.43
4.44-4.96
4.97-5.35
5.36-5.91
5.92-6.79
6.80-7.56
7.57-7.83
7.84-8.09
8.10-9.51
9.52-10.1
10.2-11.3
11.4-13.1
13.2-14.9
15.0-16.1
16.2-17.8
17.9-19.1
19.2-22.4
22.5-23.5
Thermal Unit
Number
B 0.44
B 0.51
B 0.57
B 0.63
B 0.71
B 0.81
B 0.92
B 1.03
B 1.16
B 1.30
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
B 5.5
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B 14
B 15.5
B 17.5
B 19.5
B 22
B 25
B 28.0
B 32
B 36
B 40
23.6-26.0 B 45
Table 70
Motor Full-Load
Current (Amp)
4.24-4.62
4.63-5.05
5.06-5.54
5.55-6.13
6.14-6.44
6.45-7.48
7.49-8.55
8.56-9.74
9.75-11.1
11.2-12.7
12.8-14.4
14.5-16.4
16.5-18.9
19.0-21.6
21.7-23.3
23.4-24.9
25.0-26.9
27.0-29.1
29.2-31.3
31.4-33.5
33.6-36.9
37.0-39.1
39.2-40.9
41.0-45.0
Thermal Unit
Number
AR 8.5
AR 9.3
AR 10.2
AR 11.2
AR 12.4
AR 13.6
AR 15.4
AR 17.6
AR 20.5
AR 23
AR 27
AR 30
AR 35
AR 40
AR 44
AR 47
AR 51
AR 55
AR 60
AR 66
AR 72
AR 79
AR 86
AR 94
Table 67
Motor Full-Load
Current (Amp)
3.79-4.14
4.15-4.44
4.45-5.22
5.23-5.29
5.30-5.99
6.00-6.82
6.83-7.68
7.69-7.92
7.93-8.47
8.48-9.99
10.0-10.8
10.9-12.3
12.4-12.9
13.0-15.1
15.2-16.7
16.8-17.9
18.0-20.1
20.2-23.8
23.9-25.8
25.9-28.3
28.4-29.6
29.7-32.1
32.2-34.4
34.5-38.3
38.4-39.9
Thermal Unit
Number
B 5.50
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B 14
B 15.5
B 17.5
B 19.5
B 22
B 25
B 28.0
B 32
B 36
B 40
B 45
B 50
B 56
B 62
B 70
B 79
40.0-45.0 B 88
Table 71
Motor Full-Load
Current (Amp)
3.98-4.53
4.54-5.03
5.04-5.46
5.47-6.01
6.02-6.31
6.32-7.19
7.20-8.29
8.30-9.49
9.50-11.0
11.1-12.6
12.7-14.3
14.4-16.5
16.6-19.2
19.3-21.9
22.0-23.8
23.9-25.5
25.6-27.7
27.8-30.1
30.2-32.5
32.6-34.8
34.9-38.5
38.6-41.5
41.6-45.0
Thermal Unit
Number
AR 8.5
AR 9.3
AR 10.2
AR 11.2
AR 12.4
AR 13.6
AR 15.4
AR 17.6
AR 20.5
AR 23
AR 27
AR 30
AR 35
AR 40
AR 44
AR 47
AR 51
AR 55
AR 60
AR 66
AR 72
AR 79
AR 86
5/98

5/98
Table 72
Motor Full-Load
Current (Amp)
1 T. U. 3 T. U.
2.38-2.62
2.63-2.94
2.95-3.31
3.32-3.43
3.44-3.81
3.82-4.32
4.33-4.75
4.76-5.38
5.39-5.75
5.76-5.97
5.98-6.30
6.31-6.55
6.56-6.89
6.90-7.14
7.15-7.36
7.37-8.30
8.31-8.59
8.60-9.01
9.02-9.68
9.69-9.99
10.0-10.9
11.0-11.3
11.4-12.4
12.5-12.9
13.0-14.0
14.1-14.5
14.6-15.7
2.38-2.62
2.63-2.94
2.95-3.31
3.32-3.43
3.44-3.81
3.82-4.32
4.33-4.75
4.76-5.38
5.39-5.75
5.76-5.97
5.98-6.30
6.31-6.55
6.56-6.89
6.90-7.14
7.15-7.36
7.37-8.30
8.31-8.59
8.60-9.01
9.02-9.68
9.69-9.99
10.0-10.9
11.0-11.3
11.4-12.0
....
....
....
....
15.8-16.6
16.7-18.0 ....
....
Thermal
Unit
Number
FB 3.33
FB 3.71
FB 4.1
FB 4.5
FB 4.75
FB 5.3
FB 6.1
FB 6.75
FB 7.45
FB 7.8
FB 8.21
FB 8.6
FB 9.0
FB 9.5
FB 10
FB 10.6
FB 11.2
FB 12.1
FB 13.1
FB 13.9
FB 14.8
FB 15.6
FB 16.4
FB 17.6
FB 18.4
FB 19.4
FB 21.1
FB 22.6
FB 23.6
Following Selections for Size M-1
& M-1P Only.
....
....
....
....
....
....
16.7-17.6
17.7-18.3
18.4-19.4
19.5-20.5
20.6-21.7
21.8-22.8
22.9-24.3
24.4-24.7
11.4-12.4
12.5-12.9
13.0-14.0
14.1-14.5
14.6-15.7
15.8-16.6
16.7-17.6
17.7-18.3
18.4-19.4
19.5-20.5
20.6-21.7
21.8-22.8
22.9-24.3
24.4-24.7
24.8-25.4
25.5-26.0 24.8-25.4
25.5-26.0
FB 16.4
FB 17.6
FB 18.4
FB 19.4
FB 21.1
FB 22.6
FB 23.6
FB 24.8
FB 26.7
FB 28.3
FB 29.6
FB 30.5
FB 32.5
FB 34.1
FB 35
FB 36.6
Following Selections for Size M-
1P Only.
26.1-27.7
27.8-28.9
29.0-30.6
....
....
....
30.7-32.5
32.6-36.0 ....
....
FB 38.3
FB 40.2
FB 42
FB 44
FB 46
Table 73
Motor Full-Load
Current (Amp)
1 T. U. 3 T. U.
2.42-2.67
2.68-3.00
3.01-3.36
3.37-3.53
3.54-3.91
3.92-4.41
4.42-4.83
4.84-5.45
5.46-5.89
5.90-6.04
6.05-6.55
6.56-6.72
6.73-7.00
7.01-7.39
7.40-7.54
7.55-8.41
8.42-8.91
8.92-9.16
9.17-10.0
10.1-10.3
10.4-11.4
11.5-11.8
11.9-12.9
13.0-13.4
13.5-14.2
14.3-15.1
15.2-18.0
2.42-2.67
2.68-3.00
3.01-3.36
3.37-3.53
3.54-3.91
3.92-4.41
4.42-4.83
4.84-5.45
5.46-5.89
5.90-6.04
6.05-6.55
6.56-6.72
6.73-7.00
7.01-7.39
7.40-7.54
7.55-8.41
8.42-8.91
8.92-9.16
9.17-10.0
10.1-10.3
10.4-11.4
11.5-11.8
11.9-12.9
....
....
....
....
Thermal
Unit
Number
FB 3.33
FB 3.71
FB 4.1
FB 4.5
FB 4.75
FB 5.3
FB 6.1
FB 6.75
FB 7.45
FB 7.8
FB 8.21
FB 8.6
FB 9.0
FB 9.5
FB 10
FB 10.6
FB 11.2
FB 12.1
FB 13.1
FB 13.9
FB 14.8
FB 15.6
FB 16.4
FB 17.6
FB 18.4
FB 19.4
FB 21.1
Following Selections for Size M-1
& M-1P Only.
....
....
....
....
....
15.2-17.1
17.2-18.0
18.1-18.9
19.0-19.7
19.8-20.9
21.0-21.9
22.0-23.1
23.2-24.3
24.4-25.5
25.6-26.0
11.5-11.8
11.9-12.9
13.0-13.4
13.5-14.2
14.3-15.1
15.2-17.1
17.2-18.0
18.1-18.9
19.0-19.7
19.8-20.9
21.0-21.9
22.0-23.1
23.2-24.3
24.4-25.5
25.6-26.0
FB 15.6
FB 16.4
FB 17.6
FB 18.4
FB 19.4
FB 21.1
FB 22.6
FB 23.6
FB 24.8
FB 26.7
FB 28.3
FB 29.6
FB 30.5
FB 32.6
FB 34.1
Following Selections for Size M-
1P Only.
26.1-26.8
26.9-27.3
27.4-28.7
28.8-30.2
30.3-31.9
32.0-36.0
....
....
....
....
....
....
FB 35
FB 36.6
FB 38.3
FB 40.2
FB 42
FB 44
© 1998 Square D All Rights Reserved
Table 74
Motor Full-Load
Current (Amp)
1 T. U. 3 T. U.
2.23-2.47
2.48-2.76
2.77-3.04
3.05-3.24
3.25-3.61
3.62-4.19
4.20-4.62
4.63-5.14
5.15-5.39
5.40-5.69
5.70-5.99
6.00-6.29
6.30-6.64
6.65-6.99
7.00-7.39
7.40-7.79
7.80-7.94
7.95-8.49
8.50-8.99
9.00-9.59
9.60-10.1
10.2-10.6
10.7-11.3
11.4-12.0
12.0-12.6
12.7-13.8
13.9-14.7
14.8-15.2
15.3-16.2
16.3-18.0
Table 76
2.23-2.47
2.48-2.76
2.77-3.04
3.05-3.24
3.25-3.61
3.62-4.19
4.20-4.62
4.63-5.14
5.15-5.39
5.40-5.69
5.70-5.99
6.00-6.29
6.30-6.64
6.65-6.99
7.00-7.39
7.40-7.79
7.80-7.94
7.95-8.49
8.50-8.99
9.00-9.59
9.60-10.1
10.2-10.6
10.7-11.3
11.4-12.0
....
....
....
....
....
....
Motor Full-Load
Current (Amp)
19.9-20.8
20.9-22.2
22.3-23.8
23.9-25.4
25.5-27.2
27.3-29.2
29.3-31.9
32.0-33.8
33.9-36.1
36.2-38.5
38.6-41.4
41.5-43.6
43.7-45.9
46.0-48.2
48.3-50.7
50.8-53.9
54.0-56.7
56.8-60.8
60.9-67.6
67.6-73.6
73.7-82.9
Thermal Unit Selection
Tables 72 thru 77
Thermal Unit
Number
FB 26.7
FB 28.3
FB 29.6
FB 30.5
FB 32.6
FB 34.1
FB 38.3
FB 40.2
FB 42
FB 44
FB 46
FB 48
FB 50.5
FB 52.5
FB 55.5
FB 58
FB 60
FB 63.5
FB 69
FB 77
FB 84
83.0-86.0 FB 92
Thermal
Unit
Number
FB 3.33
FB 3.71
FB 4.1
FB 4.5
FB 4.75
FB 5.3
FB 6.1
FB 6.75
FB 7.45
FB 7.8
FB 8.21
FB 8.6
FB 9.0
FB 9.5
FB 10
FB 10.6
FB 11.2
FB 12.1
FB 13.1
FB 13.9
FB 14.8
FB 15.6
FB 16.4
FB 17.6
FB 18.4
FB 19.4
FB 21.1
FB 22.6
FB 23.6
FB 24.8
Following Selections for Size 1
Only.
....
....
13.9-14.7
14.8-15.2
15.3-16.2
16.3-17.4
17.5-18.5
18.6-19.6
19.7-20.2
20.3-21.5
21.6-22.4
22.5-23.2
23.3-24.3
24.4-25.4
25.5-26.0
12.0-12.6
12.7-13.8
13.9-14.7
14.8-15.2
15.3-16.2
16.3-17.4
17.5-18.5
18.6-19.6
19.7-20.2
20.3-21.5
21.6-22.4
22.5-23.2
23.3-24.3
24.4-25.4
25.5-26.0
FB 18.4
FB 19.4
FB 21.1
FB 22.6
FB 23.6
FB 24.8
FB 26.7
FB 28.3
FB 29.6
FB 30.5
FB 32.6
FB 34.1
FB 35
FB 36.6
FB 38.3
Table 75
Motor Full-Load
Current (Amp)
3.22-3.57
3.58-4.14
4.15-4.56
4.57-5.10
5.11-5.39
5.40-5.64
5.65-5.96
5.97-6.25
6.26-6.58
6.59-6.91
6.92-7.41
7.42-7.82
7.83-8.32
8.33-8.89
8.90-9.47
9.48-10.0
10.1-10.5
10.6-11.1
11.2-12.0
12.1-12.7
12.8-13.5
13.6-14.6
14.7-15.7
15.8-16.5
16.6-17.4
17.5-18.8
18.9-20.1
20.2-21.0
21.1-21.6
21.7-23.3
23.4-24.3
24.4-25.0
25.1-26.3
26.4-27.6
27.7-29.1
29.2-30.4
30.5-32.0
32.1-33.3
33.4-35.2
35.3-37.0
37.1-38.5
38.6-40.7
Thermal Unit
Number
FB 4.75
FB 5.3
FB 6.1
FB 6.75
FB 7.45
FB 7.8
FB 8.21
FB 8.6
FB 9.0
FB 9.5
FB 10
FB 10.6
FB 11.2
FB 12.1
FB 13.1
FB 13.9
FB 14.8
FB 15.6
FB 16.4
FB 17.6
FB 18.4
FB 19.4
FB 21.1
FB 22.6
FB 23.6
FB 24.8
FB 26.7
FB 28.3
FB 29.6
FB 30.5
FB 32.6
FB 34.1
FB 35
FB 36.6
FB 38.3
FB 40.2
FB 42
FB 44
FB 46
FB 48
FB 50.5
FB 52.5
40.8-45.0 FB 55.5
Table 77
Motor Full-Load
Current (Amp)
48.0-50.9
51.0-53.7
53.8-57.0
57.1-60.4
60.5-64.0
64.1-71.9
72.0-83.9
84.0-93.1
93.2-104
105-109
110-123
124-133
Thermal Unit
Number
FB 50.5
FB 52.5
FB 55.5
FB 58
FB 60
FB 63.5
FB 69
FB 77
FB 84
FB 92
FB 105
FB 115
33

Thermal Unit Selection
Tables 78 thru 83
34
Table 78
Motor Full-Load
Current (Amp)
1 T. U.
2.26-2.51
2.52-2.82
2.83-3.09
3.10-3.30
3.31-3.69
3.70-4.27
4.28-4.72
4.73-5.25
5.26-5.53
5.54-5.81
5.82-6.14
6.15-6.44
6.45-6.81
6.82-7.19
7.20-7.59
7.60-7.99
8.00-8.17
8.18-8.74
8.75-9.31
9.32-9.94
9.95-10.5
10.6-11.1
11.2-11.9
12.0-12.4
12.5-13.1
13.2-14.3
14.4-15.3
2 T. U. or
3 T. U.
2.26-2.51
2.52-2.82
2.83-3.09
3.10-3.30
3.31-3.69
3.70-4.27
4.28-4.72
4.73-5.25
5.26-5.53
5.54-5.81
5.82-6.14
6.15-6.44
6.45-6.81
6.82-7.19
7.20-7.59
7.60-7.99
8.00-8.17
8.18-8.74
8.75-9.31
9.32-9.94
9.95-10.5
10.6-11.1
11.2-12.0
....
....
....
....
15.4-15.9
16.0-18.0 ....
....
Thermal
Unit
Number
FB 3.33
FB 3.71
FB 4.1
FB 4.5
FB 4.75
FB 5.3
FB 6.1
FB 6.75
FB 7.45
FB 7.8
FB 8.21
FB 8.6
FB 9.0
FB 9.5
FB 10
FB 10.6
FB 11.2
FB 12.1
FB 13.1
FB 13.9
FB 14.8
FB 15.6
FB 16.4
FB 17.6
FB 18.4
FB 19.4
FB 21.1
FB 22.6
FB 23.6
Following Selections for Size 1
Only.
....
....
....
14.4-15.3
15.4-15.9
16.0-16.9
17.0-18.3
18.4-19.5
19.6-20.5
20.6-21.1
21.2-22.6
22.7-23.7
12.0-12.4
12.5-13.1
13.2-14.3
14.4-15.3
15.4-15.9
16.0-16.9
17.0-18.3
18.4-19.5
19.6-20.5
20.6-21.1
21.2-22.6
22.7-23.7
23.8-24.3
24.4-26.0 23.8-24.3
24.4-26.0
FB 17.6
FB 18.4
FB 19.4
FB 21.1
FB 22.6
FB 23.6
FB 24.8
FB 26.7
FB 28.3
FB 29.6
FB 30.5
FB 32.6
FB 35
Table 79
Motor Full-Load
Current (Amp)
3.31-3.67
3.68-4.23
4.24-4.69
4.70-5.21
5.22-5.49
5.50-5.74
5.75-6.07
6.08-6.35
6.36-6.71
6.72-7.03
7.04-7.53
7.54-7.91
7.92-8.53
8.54-9.14
9.15-9.71
9.72-10.2
10.3-10.8
10.9-11.5
11.6-12.3
12.4-13.0
13.1-13.9
14.0-15.1
15.2-16.1
16.2-16.9
17.0-17.9
18.0-19.4
19.5-20.7
20.8-21.7
21.8-22.3
22.4-23.9
24.0-25.1
25.2-25.9
26.0-27.1
27.2-28.6
28.7-30.1
30.2-31.7
31.8-33.3
33.4-34.5
34.6-36.5
36.6-38.5
38.6-39.9
40.0-45.0
Thermal Unit
Number
FB 4.75
FB 5.3
FB 6.1
FB 6.75
FB 7.45
FB 7.8
FB 8.21
FB 8.6
FB 9.0
FB 9.5
FB 10
FB 10.6
FB 11.2
FB 12.1
FB 13.1
FB 13.9
FB 14.8
FB 15.6
FB 16.4
FB 17.6
FB 18.4
FB 19.4
FB 21.1
FB 22.6
FB 23.6
FB 24.8
FB 26.7
FB 28.3
FB 29.6
FB 30.5
FB 32.6
FB 34.1
FB 35
FB 36.6
FB 38.3
FB 40.2
FB 42
FB 44
FB 46
FB 48
FB 50.5
FB 52.5
© 1998 Square D All Rights Reserved
Table 80
Motor Full-Load
Current (Amp)
20.5-21.7
21.8-23.1
23.2-24.8
24.9-26.5
26.6-28.4
28.5-30.4
30.5-32.8
32.9-34.9
35.0-37.3
37.4-39.8
39.9-42.5
42.6-45.8
45.9-48.2
48.3-50.6
50.7-53.1
53.2-56.5
56.6-59.4
59.5-63.4
63.5-71.0
71.1-78.8
78.9-86.0
Table 82
Motor Full-Load
Current (Amp)
2.36-2.63
2.64-2.96
2.97-3.23
3.24-3.45
3.46-3.86
3.87-4.44
4.45-4.95
4.96-5.47
5.48-5.75
5.76-6.09
6.10-6.42
6.43-6.75
6.76-7.16
7.17-7.43
7.44-7.99
8.00-8.46
8.47-9.19
9.20-9.74
9.75-10.3
10.4-10.8
10.9-11.6
11.7-12.2
12.3-13.1
13.2-13.7
13.8-14.3
14.4-15.5
15.6-16.7
16.8-17.6
17.7-18.6
18.7-19.9
20.0-21.1
21.2-25.0
Thermal Unit
Number
FB 26.7
FB 28.3
FB 29.6
FB 30.5
FB 32.6
FB 34.1
FB 38.3
FB 40.2
FB 42
FB 44
FB 46
FB 48
FB 50.5
FB 52.5
FB 55.5
FB 58
FB 60
FB 63.5
FB 69
FB 77
FB 84
Thermal Unit
Number
FB 3.33
FB 3.71
FB 4.1
FB 4.5
FB 4.75
FB 5.3
FB 6.1
FB 6.75
FB 7.45
FB 7.8
FB 8.21
FB 8.6
FB 9.0
FB 9.5
FB 10
FB 10.6
FB 11.2
FB 12.1
FB 13.1
FB 13.9
FB 14.8
FB 15.6
FB 16.4
FB 17.6
FB 18.4
FB 19.4
FB 21.1
FB 22.6
FB 23.6
FB 24.8
FB 92
FB 105
Table 81
Motor Full-Load
Current (Amp)
52.2-55.6
55.7-58.8
58.9-62.5
62.6-66.0
66.1-70.1
70.2-78.6
78.7-92.0
92.1-102
103-114
115-123
124-133
Table 83
Motor Full-Load
Current (Amp)
2.30-2.60
2.61-2.87
2.88-3.17
3.18-3.37
3.38-3.76
3.77-4.29
4.30-4.75
4.76-5.26
5.27-5.51
5.52-5.78
5.79-6.13
6.14-6.41
6.42-6.75
6.76-7.09
7.10-7.57
7.58-7.90
7.91-8.81
8.82-9.47
9.48-10.0
10.1-10.7
10.8-11.4
11.5-12.1
12.2-13.1
13.2-13.7
13.8-14.7
14.8-16.0
16.1-17.3
17.4-18.2
18.3-19.4
19.5-20.7
20.8-22.3
22.4-23.5
23.6-24.2
Thermal Unit
Number
FB 50.5
FB 52.5
FB 55.5
FB 58
FB 60
FB 63.5
FB 69
FB 77
FB 84
FB 92
FB 105
Thermal Unit
Number
FB 3.33
FB 3.71
FB 4.1
FB 4.5
FB 4.75
FB 5.3
FB 6.1
FB 6.75
FB 7.45
FB 7.8
FB 8.21
FB 8.6
FB 9.0
FB 9.5
FB 10.0
FB 10.6
FB 11.2
FB 12.1
FB 13.1
FB 13.9
FB 14.8
FB 15.6
FB 16.4
FB 17.6
FB 18.4
FB 19.4
FB 21.1
FB 22.6
FB 23.6
FB 24.8
FB 26.7
FB 28.3
FB 29.6
24.3-26.0 FB 30.5
5/98

5/98
Table 84
Motor Full-Load
Current (Amp)
3.38-3.78
3.79-4.37
4.38-4.87
4.88-5.51
5.52-5.73
5.74-6.09
6.10-6.44
6.45-6.75
6.76-7.15
7.16-7.57
7.58-8.07
8.08-8.47
8.48-8.81
8.82-9.46
9.47-10.1
10.2-10.8
10.9-11.4
11.5-12.1
12.2-13.1
13.2-13.8
13.9-14.8
14.9-16.1
16.2-17.4
17.5-18.3
18.4-19.5
19.6-21.0
21.1-22.5
22.6-23.7
23.8-24.5
24.6-26.4
26.5-27.7
27.8-28.7
28.8-29.9
30.0-31.8
31.9-33.5
33.6-35.1
35.2-37.1
37.2-38.8
38.9-41.1
Thermal Unit
Number
FB 4.75
FB 5.3
FB 6.1
FB 6.75
FB 7.45
FB 7.8
FB 8.21
FB 8.6
FB 9.0
FB 9.5
FB 10
FB 10.6
FB 11.2
FB 12.1
FB 13.1
FB 13.9
FB 14.8
FB 15.6
FB 16.4
FB 17.6
FB 18.4
FB 19.4
FB 21.1
FB 22.6
FB 23.6
FB 24.8
FB 26.7
FB 28.3
FB 29.6
FB 30.5
FB 32.6
FB 34.1
FB 35
FB 36.6
FB 38.3
FB 40.2
FB 42
FB 44
FB 46
41.2-45.0 FB 48
Table 85
Motor Full-Load
Current (Amp)
42.9-45.4
45.6-48.3
48.4-52.4
52.5-55.9
56.0-59.8
59.9-63.8
63.9-67.9
68.0-72.6
72.7-83.2
83.3-94.7
94.8-105
106-116
117-121
122-133
Thermal Unit
Number
FB 44
FB 46
FB 48
FB 50.5
FB 52.5
FB 55.5
FB 58
FB 60
FB 63.5
FB 69
FB 77
FB 84
FB 92
FB 105
Table 86
Motor Full-Load
Current (Amp)
0.43-0.44
0.45-0.47
0.48-0.53
0.54-0.61
0.62-0.65
0.66-0.71
0.72-0.79
0.80-0.86
0.87-0.96
0.97-1.04
1.05-1.17
1.18-1.31
1.32-1.38
1.39-1.47
1.48-1.57
1.58-1.65
1.66-1.77
1.78-1.93
1.94-2.18
2.19-2.46
2.47-2.68
2.69-2.87
2.88-3.07
3.08-3.59
3.60-3.79
3.80-4.27
4.28-4.59
4.60-4.90
4.91-5.06
5.07-5.44
5.45-6.24
6.25-7.21
7.22-7.69
7.70-8.24
8.25-8.81
8.82-9.32
9.33-9.99
10.0-10.5
10.6-11.5
11.6-12.2
12.3-13.3
13.4-15.8
15.9-18.4
18.5-20.5
20.6-21.5
21.6-23.9
24.0-26.8
26.9-28.2
28.3-29.8
29.9-32.0
Table 89
Motor Full-Load
Current (Amp)
10.0-11.1
11.2-12.0
12.1-13.3
13.4-15.1
15.2-17.1
17.2-18.6
18.7-21.4
21.5-25.7
25.8-28.2
28.3-29.7
29.8-31.2
31.3-32.1
32.2-35.7
35.8-40.7
40.8-48.0
Thermal Unit
Number
A .49
A .54
A .59
A .65
A .71
A .78
A .86
A .95
A 1.02
A 1.16
A 1.25
A 1.39
A 1.54
A 1.63
A 1.75
A 1.86
A 1.99
A 2.15
A 2.31
A 2.57
A 2.81
A 3.61
A 3.95
A 4.32
A 4.79
A 5.30
A 5.78
A 6.20
A 6.99
A 7.65
A 8.38
A 9.25
A 9.85
A 11.0
A 11.9
A 132
A 14.1
A 14.8
A 16.2
A 17.9
A 21.3
A 25.2
A 27.1
A 29.5
A 31.9
A 33.8
A 35.9
A 40.0
A 42.3
A 44.7
Thermal Unit
Number
B 17.5
B 19.5
B 22
B 25
B 28.0
B 32
B 36
B 40
B 45
B 50
B 56
B 62
B 70
B 79
B 88
© 1998 Square D All Rights Reserved
Table 87
Motor Full-Load
Current (Amp)
0.40-0.41
0.42-0.45
0.46-0.51
0.52-0.58
0.59-0.63
0.64-0.68
0.69-0.76
0.77-0.83
0.84-0.93
0.94-1.01
1.02-1.14
1.15-1.28
1.29-1.34
1.35-1.44
1.45-1.55
1.56-1.61
1.62-1.71
1.72-1.85
1.86-2.04
2.05-2.38
2.39-2.60
2.61-2.77
2.78-2.98
2.99-3.40
3.41-3.64
3.65-4.08
4.09-4.38
4.39-4.68
4.69-4.79
4.80-5.11
5.12-5.84
5.85-6.70
6.71-7.18
7.19-7.70
7.71-8.14
8.15-8.56
8.57-9.15
9.16-9.80
9.81-10.6
Thermal Unit Selection
Tables 84 thru 91
Thermal Unit
Number
A .49
A .54
A .59
A .65
A .71
A .78
A .86
A .95
A 1.02
A 1.16
A 1.25
A 1.39
A 1.54
A 1.63
A 1.75
A 1.86
A 1.99
A 2.15
A 2.31
A 2.57
A 2.81
A 3.61
A 3.95
A 4.32
A 4.79
A 5.30
A 5.78
A 6.20
A 6.99
A 7.65
A 8.38
A 9.25
A 9.85
A 11.0
A 11.9
A 13.2
A 14.1
A 14.8
A 16.2
10.7-11.0 A 17.9
Table 90
Motor Full-Load
Current (Amp)
4.88-5.13
5.14-5.85
5.86-6.67
6.68-7.09
7.10-7.62
7.63-8.04
8.05-8.46
8.47-9.11
9.12-9.69
9.70-10.5
10.6-11.6
11.7-12.3
12.4-14.6
14.7-16.8
16.9-17.9
18.0-18.7
18.8-19.8
19.9-21.4
21.5-22.8
22.9-23.8
23.9-26.0
Thermal Unit
Number
A7.65
A8.38
A9.25
A9.85
A11.0
A11.9
A13.2
A14.1
A14.8
A16.2
A17.9
A21.3
A25.2
A27.1
A29.5
A31.9
A33.8
A35.9
A40.0
A42.3
A44.7
Table 88
Motor Full-Load
Current (Amp)
0.39-0.40
0.41-0.44
0.45-0.49
0.50-0.57
0.58-0.61
0.62-0.66
0.67-0.73
0.74-0.80
0.81-0.90
0.91-0.97
0.98-1.09
1.10-1.23
1.24-1.57
1.58-1.66
1.67-1.79
1.80-1.99
2.00-2.31
2.32-2.50
2.51-2.66
2.67-2.85
2.86-3.26
3.27-3.49
3.50-3.92
3.93-4.20
4.21-4.49
4.50-4.64
4.65-4.94
4.95-5.62
5.63-6.39
6.40-6.82
6.83-7.27
7.28-7.71
7.72-8.13
8.14-8.64
8.65-9.15
9.16-9.97
Thermal Unit
Number
A .49
A .54
A .59
A .65
A .71
A .78
A .86
A .95
A 1.02
A 1.16
A 1.25
A 1.39
A 1.86
A 1.99
A 2.15
A 2.31
A 2.57
A 2.81
A 3.61
A 3.95
A 4.32
A 4.79
A 5.30
A 5.78
A 6.20
A 6.99
A 7.65
A 8.38
A 9.25
A 9.85
A 11.0
A 11.9
A 13.2
A 14.1
A 14.8
A 16.2
9.98-11.0 A 17.9
Table 91
Motor Full-load
Current (Amp)
4.80-5.07
5.08-5.73
5.74-6.48
6.49-6.90
6.91-7.25
7.26-7.81
7.82-8.29
8.30-8.81
8.82-9.40
9.41-10.0
10.1-11.1
11.2-11.7
11.8-13.7
13.8-16.0
13.1-16.9
17.0-17.7
17.8-18.7
18.8-20.2
20.3-21.4
21.5-22.5
22.6-23.8
Thermal Unit
Number
A 7.65
A 8.38
A 9.25
A 9.85
A 11.0
A 11.9
A 13.2
A 14.1
A 14.8
A 16.2
A 17.9
A 21.3
A 25.2
A 27.1
A 29.5
A 31.9
A 33.8
A 35.9
A 40.0
A 42.3
A 44.7
23.9-26.0 A48.0
35

Thermal Unit Selection
Tables 92 thru 101
36
Table 92
Motor Full-Load
Current (Amp)
10.5-11.7
11.8-12.5
12.6-14.0
14.1-15.8
15.9-18.0
18.1-19.6
19.7-23.5
23.6-27.4
27.6-30.5
30.6-32.2
32.3-34.0
34.1-35.2
35.3-39.5
39.6-43.9
44.0-48.0
Table 96
Motor Full-Load
Current (Amp)
49.5-52.0
52.1-54.8
54.9-58.7
58.8-63.3
63.4-68.3
68.4-73.6
73.7-79.4
79.5-85.5
85.6-89.7
89.8-94.8
94.9-99.9
100-105
106-111
112-126
127-131
132-141
142-150
Thermal Unit
Number
B 17.5
B 19.5
B 22
B 25
B 28.0
B 32
B 36
B 40
B 45
B 50
B 56
B 62
B 70
B 79
B 88
Thermal Unit
Number
CC 64.3
CC 68.5
CC 74.6
CC 81.5
CC 87.7
CC 94.0
CC 103
CC 112
CC 121
CC 132
CC 143
CC 156
CC 167
CC 180
CC 196
CC 208
CC 219
Table 93
Motor Full-Load
Current (Amp)
23.8-25.2
25.3-26.8
26.9-28.4
28.5-30.3
30.4-32.1
32.2-34.2
34.3-36.3
36.4-40.2
40.3-43.1
46.2-45.9
46.0-49.2
49.3-51.6
51.7-54.2
54.3-55.7
55.8-60.3
60.4-63.5
63.6-67.1
67.2-70.3
70.4-74.1
74.2-78.3
78.4-83.3
Thermal Unit
Number
CC 36.4
CC 39.6
CC 42.7
CC 46.6
CC 50.1
CC 54.5
CC 59.4
CC 64.3
CC 68.5
CC 74.6
CC 81.5
CC 87.7
CC 94.0
CC 103
CC 112
CC 121
CC 132
CC 143
CC 156
CC 167
CC 180
83.4-86.0 CC 196
Table 97
Motor Full-Load
Current (Amp)
0.57-0.60
0.61-0.66
0.67-0.73
0.74-0.81
0.82-0.90
0.91-1.05
1.06-1.15
1.16-1.25
1.26-1.35
1.36-1.47
1.48-1.58
1.59-1.74
1.75-1.94
1.95-2.20
2.21-2.47
2.48-2.76
2.77-3.07
3.08-3.45
3.46-3.81
3.82-4.20
4.21-4.65
4.66-5.29
5.30-5.84
5.85-6.27
6.28-6.97
6.98-7.59
7.60-7.89
7.90-8.95
8.96-10.3
10.4-11.7
11.8-13.3
13.4-15.2
15.3-17.2
17.3-19.7
19.8-22.4
22.5-26.0
Thermal Unit
Number
AR 1.05
AR 1.15
AR 1.26
AR 1.39
AR 1.53
AR 1.68
AR 1.85
AR 2.04
AR 2.24
AR 2.46
AR 2.71
AR 2.98
AR 3.28
AR 3.62
AR 3.98
AR 4.37
AR 4.80
AR 5.3
AR 5.8
AR 6.4
AR 7.0
AR 7.7
AR 8.5
AR 9.3
AR 10.2
AR 11.2
AR 12.4
AR 13.6
AR 15.4
AR 17.6
AR 20.5
AR 23
AR 27
AR 30
AR 35
AR 40
© 1998 Square D All Rights Reserved
Table 94
Motor Full-Load
Current (Amp)
25.8-27.5
27.6-29.4
29.5-31.4
31.5-33.2
33.3-36.2
36.3-38.8
38.9-41.6
41.6-44.7
44.8-47.9
48.0-50.9
51.0-54.4
54.5-57.4
57.5-60.6
60.7-63.9
64.0-68.4
68.5-73.4
73.5-78.7
78.8-83.8
Thermal Unit
Number
CC 36.4
CC 39.6
CC 42.7
CC 46.6
CC 50.1
CC 54.5
CC 59.4
CC 64.3
CC 68.5
CC 74.6
CC 81.5
CC 87.7
CC 94.0
CC 103
CC 112
CC 121
CC 132
CC 143
83.9-86.0 CC 156
Table 98
Motor Full-Load
Current (Amp)
4.24-4.62
4.63-5.05
5.06-5.54
5.55-6.13
6.14-6.44
6.45-7.48
7.49-8.55
8.56-9.74
9.75-11.1
11.2-12.7
12.8-14.4
14.5-16.4
16.5-18.9
19.0-21.6
21.7-23.3
23.4-24.9
25.0-26.9
27.0-29.1
29.2-31.3
31.4-33.5
33.6-36.9
37.0-39.1
39.2-40.9
41.0-45.0
Table 100
Motor Full-Load
Current (Amp)
50-55.9
56-60.9
91-65.9
66-69.9
70-75.9
76-81.9
82-86.9
87-92.9
93-97.9
98-107.9
108-113.9
114-125.9
Thermal Unit
Number
AR 8.5
AR 9.3
AR 10.2
AR 11.2
AR 12.4
AR 13.6
AR 15.4
AR 17.6
AR 20.5
AR 23
AR 27
AR 30
AR 35
AR 40
AR 44
AR 47
AR 51
AR 55
AR 60
AR 66
AR 72
AR 79
AR 86
AR 94
Thermal Unit
Number
E 88
E 89
E 91
E 92
E 93
E 94
E 96
E 97
E 98
E 99
E 101
E 102
Table 95
Motor Full-Load
Current (Amp)
42.5-44.7
44.8-47.9
48.0-51.2
51.3-55.2
55.3-59.4
59.5-63.8
63.9-68.8
68.9-73.8
73.9-77.7
77.8-82.5
82.6-86.6
86.7-91.9
92.0-97.2
97.3-104
105-114
115-123
124-150
Table 99
Motor Full-Load
Current (Amp)
27.1-30.0
30.1-33.2
33.3-35.7
35.8-39.4
39.5-43.4
43.5-46.9
47.0-51.5
51.6-57.0
57.1-62.8
62.9-69.1
69.2-75.0
57.1-83.3
Table 101
Motor Full-Load
Current (Amp)
105-116
117-132
133-148
149-165
166-184
185-207
208-229
230-266
Thermal Unit
Number
CC 64.3
CC 68.5
CC 74.6
CC 81.5
CC 87.7
CC 94.0
CC 103
CC 112
CC 121
CC 132
CC 143
CC 156
CC 167
CC 180
CC 196
CC 208
CC 219
Thermal Unit
Number
E 67
E 69
E 70
E 71
E 72
E 73
E 74
E 76
E 77
E 78
E 79
E 80
Thermal Unit
Number
AR 3.28
AR 3.62
AR 3.98
AR 4.37
AR 4.80
AR 5.3
AR 5.8
AR 6.4
5/98

5/98
Table 102
Motor Full-Load
Current (Amp)
146-169
170-185
186-201
202-217
218-236
237-253
254-279
280-311
312-353
354-396
397-442
443-492
Thermal Unit
Number
AR 1.68
AR 1.85
AR 2.04
AR 2.24
AR 2.46
AR 2.71
AR 2.98
AR 3.28
AR 3.62
AR 3.98
AR 4.37
AR 4.80
493-520 AR 5.3
Table 107
Motor Full-Load
Current (Amp)
105-116
117-132
133-148
149-165
166-184
185-207
208-229
230-266
Thermal Unit
Number
AR 3.28
AR 3.62
AR 3.98
AR 4.37
AR 4.80
AR 5.3
AR 5.8
AR 6.4
Table 103
Motor Full-Load
Current (Amp)
0.57-0.60
0.61-0.66
0.67-0.73
0.74-0.81
0.82-0.90
0.91-1.05
1.06-1.15
1.16-1.25
1.26-1.35
1.36-1.47
1.48-1.58
1.59-1.74
1.75-1.94
1.95-2.20
2.21-2.47
2.48-2.76
2.77-3.07
3.08-3.45
3.46-3.81
3.82-4.20
4.21-4.65
4.66-5.26
5.30-5.84
5.85-6.27
6.28-6.97
6.98-7.59
7.60-7.89
7.90-8.95
8.96-10.3
10.4-11.7
11.8-13.3
13.4-15.2
15.3-17.2
17.3-19.7
19.8-22.4
22.5-26.0
Table 108
Motor Full-Load
Current (Amp)
146-169
170-185
186-201
202-217
218-236
237-253
254-279
280-311
312-353
354-396
397-442
443-492
Thermal Unit
Number
AR 1.05
AR 1.15
AR 1.26
AR 1.39
AR 1.53
AR 1.68
AR 1.85
AR 2.04
AR 2.24
AR 2.46
AR 2.71
AR 2.98
AR 3.28
AR 3.62
AR 3.98
AR 4.37
AR 4.80
AR 5.3
AR 5.8
AR 6.4
AR 7.0
AR 7.7
AR 8.5
AR 9.3
AR 10.2
AR 11.2
AR 12.4
AR 13.6
AR 15.4
AR 17.6
AR 20.5
AR 23
AR 27
AR 30
AR 35
AR 40
Thermal Unit
Number
AR 1.68
AR 1.85
AR 2.04
AR 2.24
AR 2.46
AR 2.71
AR 2.98
AR 3.28
AR 3.62
AR 3.98
AR 4.37
AR 4.80
493-520 AR 5.3
© 1998 Square D All Rights Reserved
Table 104
Motor Full-Load
Current (Amp)
4.24-4.62
4.63-5.05
5.06-5.54
5.55-6.13
6.14-6.44
6.45-7.48
7.49-8.55
8.56-9.74
9.75-11.1
11.2-12.7
12.8-14.4
14.5-16.4
16.5-18.9
19.0-21.6
21.7-23.3
32.4-24.9
25.0-26.9
27.0-29.1
29.2-31.3
31.4-33.5
33.6-36.9
37.0-39.1
39.2-40.9
41.0-45.0
Table 109
Motor Full-Load
Current (Amp)
0.56-0.63
0.64-0.68
0.69-0.77
0.78-0.85
0.86-0.97
0.98-1.09
1.10-1.21
1.22-1.33
1.34-1.53
1.54-1.73
1.74-1.89
1.90-2.17
2.18-2.53
2.54-2.87
2.88-3.22
3.23-3.49
3.50-3.85
3.86-4.11
4.12-4.70
4.71-5.21
5.22-5.53
5.54-6.17
6.18-7.02
7.03-7.92
7.93-8.61
8.62-9.17
9.18-10.0
10.1-11.0
11.1-11.8
11.9-13.5
13.6-15.3
15.4-17.4
17.5-19.4
19.5-22.2
22.3-25.1
25.2-27.0
Thermal Unit Selection
Tables 102 thru 110
Thermal Unit
Number
AR 8.5
AR 9.3
AR 10.2
AR 11.2
AR 12.4
AR 13.6
AR 15.4
AR 17.6
AR 20.5
AR 23
AR 27
AR 30
AR 35
AR 40
AR 44
AR 47
AR 51
AR 55
AR 60
AR 66
AR 72
AR 79
AR 86
AR 94
Thermal Unit
Number
B 0.81
B 0.92
B 1.03
B 1.16
B 1.30
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B 14
B 15.5
B 17.5
B 19.5
B 22
B 25
B 28
B 32
B 36
B 40
B 45
Table 105
Motor Full-Load
Current (Amp)
27.1-30.0
30.1-33.2
33.3-35.7
35.8-39.4
39.5-43.4
43.5-46.9
47.0-51.5
51.6-57.0
57.1-62.8
62.9-69.1
69.2-75.0
75.1-83.3
Table 106
Motor Full-Load
Current (Amp)
50-55.9
56-60.9
61-65.9
66-69.9
70-75.9
76-81.9
82-86.9
87-92.9
93-97.9
98-107.9
108-113.9
114-125.9
Table 110
Motor Full-Load
Current (Amp)
3.94-4.45
4.46-4.97
4.98-5.28
5.29-5.97
5.98-6.89
6.90-7.92
7.93-8.71
8.72-9.27
9.28-10.2
10.3-11.4
11.5-12.3
12.4-13.9
14.0-15.8
15.9-17.9
18.0-19.1
20.0-22.8
22.9-25.4
25.5-28.9
29.0-30.8
30.9-32.5
32.6-34.9
35.0-39.7
39.8-44.7
Thermal Unit
Number
E 67
E 69
E 70
E 71
E 72
E 73
E 74
E 76
E 77
E 78
E 79
E 80
Thermal Unit
Number
E 88
E 89
E 91
E 92
E 93
E 94
E 96
E 97
E 98
E 99
E 101
E 102
Thermal Unit
Number
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B 14.0
B 15.5
B 17.5
B 19.5
B 22
B 25
B 28
B 32
B 36
B 40
B 45
B 50
B 56
B 62
B 70
B 79
37

Thermal Unit Selection
Tables 111 thru 120
38
Table 111
Motor Full-Load
Current (Amp)
14.0-14.9
15.0-16.2
16.3-17.2
17.3-18.7
18.8-20.2
20.3-21.7
21.8-23.3
23.4-25.2
25.3-27.1
27.2-29.4
29.5-31.6
31.7-34.0
34.1-36.8
36.9-39.8
39.9-42.3
42.4-45.7
45.8-49.2
49.3-52.8
52.9-56.8
56.9-61.2
61.3-66.1
66.2-71.2
71.3-76.7
76.8-82.9
83.0-90.0
Table 115
Motor Full-Load
Current (Amp)
0.56-0.63
0.64-0.68
0.69-0.77
0.78-0.85
0.86-0.97
0.98-1.09
1.10-1.21
1.22-1.33
1.34-1.53
1.54-1.73
1.74-1.89
1.90-2.17
2.18-2.53
2.54-2.87
2.88-3.22
3.23-3.49
3.50-3.85
3.86-4.11
4.12-4.70
4.71-5.21
5.22-5.53
5.54-6.17
6.18-7.02
7.03-7.92
7.93-8.61
8.62-9.17
9.18-10.0
10.1-11.0
11.1-11.8
11.9-13.5
13.6-15.3
15.4-17.4
17.5-19.4
19.5-22.2
22.3-25.1
25.2-27.0
Thermal Unit
Number
CC 20.9
CC 22.8
CC 24.6
CC 26.3
CC 28.8
CC 31.0
CC 33.3
CC 36.4
CC 39.6
CC 42.7
CC 46.6
CC 50.1
CC 54.5
CC 59.4
CC 64.3
CC 68.5
CC 74.6
CC 81.5
CC 87.7
CC 94.0
CC 103
CC 112
CC 121
CC 132
CC 143
Thermal Unit
Number
B 0.81
B 0.92
B 1.03
B 1.16
B 1.30
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B 14
B 15.5
B 17.5
B 19.5
B 22
B 25
B 28
B 32
B 36
B 40
B 45
Table 112
Motor Full-Load
Current (Amp)
44.0-46.8
46.9-50.6
50.7-54.5
54.6-58.4
58.5-62.9
63.0-67.7
67.8-72.9
73.0-78.1
78.2-83.9
84.0-91.1
91.2-97.5
97.6-104
105-113
114-133
Table 116
Motor Full-Load
Current (Amp)
3.94-4.45
4.46-4.97
4.98-5.28
5.29-5.97
5.98-6.89
6.90-7.92
7.93-8.71
8.72-9.27
9.28-10.2
10.3-11.4
11.5-12.3
12.4-13.9
14.0-15.8
15.9-17.9
18.0-19.9
20.0-22.8
22.9-25.4
25.5-28.9
29.0-30.8
30.9-32.5
32.6-34.9
35.0-39.7
39.8-44.7
Table 119
Motor Full-Load
Current (Amp)
88.2-95.1
95.2-101
102-111
112-119
120-131
132-149
150-170
171-180
181-197
198-204
205-213
214-237
238-243
244-266
Thermal Unit
Number
CC 64.3
CC 68.5
CC 74.6
CC 81.5
CC 87.7
CC 94.0
CC 103
CC 112
CC 121
CC 132
CC 143
CC 156
CC 167
CC 180
Thermal Unit
Number
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B 14.0
B 15.5
B 17.5
B 19.5
B 22
B 25
B 28
B 32
B 36
B 40
B 45
B 50
B 56
B 62
B 70
B 79
Thermal Unit
Number
DD 112
DD 121
DD 128
DD 140
DD 150
DD 160
DD 185
DD 220
DD 240
DD 250
DD 265
DD 280
DD 300
DD 320
© 1998 Square D All Rights Reserved
Table 113
Motor Full-Load
Current (Amp)
88.2-95.1
95.2-101
102-111
112-119
120-131
132-149
150-170
171-180
181-197
198-204
205-213
214-237
238-243
244-266
Table 117
Motor Full-Load
Current (Amp)
14.0-14.9
15.0-16.2
16.3-17.2
17.3-18.7
18.8-20.2
20.3-21.7
21.8-23.3
23.4-25.2
25.3-27.1
27.2-29.4
29.5-31.6
31.7-34.0
34.1-36.8
36.9-39.8
39.9-42.3
42.4-45.7
45.8-49.2
49.3-52.8
52.9-56.8
56.9-61.2
61.3-66.1
66.2-71.2
71.3-76.7
76.8-82.9
Table 120
Motor Full-Load
Current (Amp)
133-148
149-174
175-195
196-219
220-239
240-271
272-308
309-348
349-397
398-429
430-495
496-520
Thermal Unit
Number
DD 112
DD 121
DD 128
DD 140
DD 150
DD 160
DD 185
DD 220
DD 240
DD 250
DD 265
DD 280
DD 300
DD 320
Thermal Unit
Number
CC 20.9
CC 22.8
CC 24.6
CC 26.3
CC 28.8
CC 31.0
CC 33.3
CC 36.4
CC 39.6
CC 42.7
CC 46.6
CC 50.1
CC 54.5
CC 59.4
CC 64.3
CC 68.5
CC 74.6
CC 81.5
CC 87.7
CC 94.0
CC 103
CC 112
CC 121
CC 132
83.0-90.0 CC 143
Thermal Unit
Number
B 1.30
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
Table 114
Motor Full-Load
Current (Amp)
133-148
149-174
175-195
196-219
220-239
240-271
272-308
309-348
349-397
398-429
430-495
496-520
Table 118
Motor Full-load
Current (Amp)
44.0-46.8
46.9-50.6
50.7-54.5
54.6-58.4
58.5-62.9
63.0-67.6
67.8-72.9
73.0-78.1
78.2-83.9
84.0-91.1
91.2-97.5
97.6-104
105-113
114-133
Thermal Unit
Number
B 1.30
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
Thermal Unit
Number
CC 64.3
CC 68.5
CC 74.6
CC 81.5
CC 87.7
CC 94.0
CC 103
CC 112
CC 121
CC 132
CC 143
CC 156
CC 167
CC 180
5/98

5/98
Table 121
Motor Full-Load
Current (Amp)
1.14-1.21
1.22-1.33
1.34-1.47
1.48-1.63
1.64-1.81
1.82-2.11
2.12-2.31
2.32-2.51
2.52-2.71
2.72-2.95
2.96-3.17
3.18-3.49
3.50-3.89
3.90-4.41
4.42-4.95
4.96-5.53
5.54-6.15
6.16-6.91
6.92-7.63
7.64-8.41
8.42-9.31
9.32-10.59
10.60-11.69
11.70-12.55
12.56-13.95
13.96-15.19
15.20-15.79
15.80-17.91
17.92-20.7
20.8-23.5
23.6-26.7
26.8-30.5
30.6-34.5
34.6-39.5
39.6-44.9
45.0-52.0
Table 125
Motor Full-Load
Current (Amp)
8.48-9.25
9.26-10.11
10.12-11.09
11.10-12.27
12.28-12.89
12.90-14.97
14.98-17.11
17.12-19.49
19.50-22.3
22.4-22.5
22.6-28.9
29.0-32.9
33.0-37.9
38.0-43.3
43.4-46.7
46.8-49.9
50.0-53.9
54.0-58.3
58.4-62.7
62.8-67.1
67.2-73.8
74.0-78.3
78.4-81.9
82.0-90.0
Thermal Unit
Number
AR 1.05
AR 1.15
AR 1.26
AR 1.39
AR 1.53
AR 1.68
AR 1.85
AR 2.04
AR 2.24
AR 2.46
AR 2.71
AR 2.98
AR 3.28
AR 3.62
AR 3.98
AR 4.37
AR 4.80
AR 5.3
AR 5.8
AR 6.4
AR 7.0
AR 7.7
AR 8.5
AR 9.3
AR 10.2
AR 11.2
AR 12.4
AR 13.6
AR 15.4
AR 17.6
AR 20.5
AR 23
AR 27
AR 30
AR 35
AR 40
Thermal Unit
Number
AR 8.5
AR 9.3
AR 10.2
AR 11.2
AR 12.4
AR 13.6
AR 15.4
AR 17.6
AR 20.5
AR 23
AR 27
AR 30
AR 35
AR 40
AR 44
AR 47
AR 51
AR 55
AR 60
AR 66
AR 72
AR 79
AR 86
AR 94
Table 122
Motor Full-Load
Current (Amp)
8.48-9.25
9.26-10.11
10.12-11.09
11.10-12.27
12.28-12.89
12.90-14.97
14.98-17.11
17.12-19.49
19.50-22.3
22.4-22.5
22.6-28.9
29.0-32.9
33.0-37.9
38.0-43.3
43.4-46.7
46.8-49.9
50.0-53.9
54.0-58.3
58.4-62.7
62.8-67.1
67.2-73.8
74.0-78.3
78.4-81.9
82.0-90.0
Table 126
Motor Full-Load
Current (Amp)
54.2-60.1
60.2-66.5
66.6-71.5
71.6-78.9
79.0-86.9
87.0-93.9
94.0-103.1
103.2-114.1
114.2-125.7
125.8-138.3
138.4-150.1
150.2-166.6
Thermal Unit
Number
AR 8.5
AR 9.3
AR 10.2
AR 11.2
AR 12.4
AR 13.6
AR 15.4
AR 17.6
AR 20.5
AR 23
AR 27
AR 30
AR 35
AR 40
AR 44
AR 47
AR 51
AR 55
AR 60
AR 66
AR 72
AR 79
AR 86
AR 94
Thermal Unit
Number
E 67
E 69
E 70
E 71
E 72
E 73
E 74
E 76
E 77
E 78
E 79
E 80
© 1998 Square D All Rights Reserved
Table 123
Motor Full-Load
Current (Amp)
54.2-60.1
60.2-66.5
66.6-71.5
71.6-78.9
79.0-86.9
87.0-93.9
94.0-103.1
103.2-114.1
114.2-125.7
125.8-138.3
138.4-150.1
150.2-166.6
Table 127
Motor Full-load
Current (Amp)
1.12-1.27
1.28-1.37
1.38-1.55
1.56-1.71
1.72-1.95
1.96-2.19
2.20-2.43
2.44-2.67
2.68-3.07
3.08-3.47
3.48-3.79
3.80-4.35
4.36-5.07
5.08-5.75
5.76-6.45
6.46-6.99
7.00-7.71
7.72-8.23
8.24-9.41
9.42-10.43
10.44-11.07
11.08-12.35
12.36-14.05
14.06-15.85
15.86-17.23
17.24-18.35
18.36-20.1
20.2-22.1
22.2-23.7
23.8-27.1
27.2-30.7
30.8-34.9
25.0-38.9
39.0-44.5
44.6-50.3
50.4-54.0
Thermal Unit Selection
Tables 121 thru 128
Thermal Unit
Number
E 67
E 69
E 70
E 71
E 72
E 73
E 74
E 76
E 77
E 78
E 79
E 80
Thermal Unit
Number
B 0.81
B 0.92
B 1.03
B 1.16
B 1.30
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B 14
B 15.5
B 17.5
B 19.5
B 22
B 25
B 28
B 32
B 36
B 40
B 45
Table 124
Motor Full-Load
Current (Amp)
1.14-1.21
1.22-1.33
1.34-1.47
1.48-1.63
1.64-1.81
1.82-2.11
2.12-2.31
2.32-2.51
2.52-2.71
2.72-2.95
2.96-3.17
3.18-3.49
3.50-3.89
3.90-4.41
4.42-4.95
4.96-5.53
5.54-6.15
6.16-6.91
6.92-7.63
7.64-8.41
8.42-9.31
9.32-10.59
10.60-11.69
11.70-12.55
12.56-13.95
13.96-15.19
15.20-15.79
15.80-17.91
17.92-20.7
20.8-23.5
23.6-26.7
26.8-30.5
30.6-34.5
34.6-39.5
39.6-44.9
45.0-52.0
Table 128
Motor Full-load
Current (Amp)
7.88-8.91
8.92-9.95
9.96-10.57
10.58-11.95
11.96-13.79
13.80-15.85
15.86-17.43
17.44-18.55
18.56-20.5
20.6-22.9
23.0-24.7
24.8-27.9
28.0-31.7
31.8-35.9
36.0-39.9
40.0-45.7
45.8-50.9
51.0-61.7
61.8-65.1
65.2-69.9
70.0-79.5
79.6-89.4
Thermal Unit
Number
AR 1.05
AR 1.15
AR 1.26
AR 1.39
AR 1.53
AR 1.68
AR 1.85
AR 2.04
AR 2.24
AR 2.46
AR 2.71
AR 2.98
AR 3.28
AR 3.62
AR 3.98
AR 4.37
AR 4.80
AR 5.3
AR 5.8
AR 6.4
AR 7.0
AR 7.7
AR 8.5
AR 9.3
AR 10.2
AR 11.2
AR 12.4
AR 13.6
AR 15.4
AR 17.6
AR 20.5
AR 23
AR 27
AR 30
AR 35
AR 40
Thermal Unit
Number
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B 14.0
B 15.5
B 17.5
B 19.5
B 22
B 25
B 28
B 32
B 36
B 40
B 45
B 50
B 56
B 62
B 70
39

Thermal Unit Selection
Tables 129 thru 136
40
Table 129
Motor Full-load
Current (Amp)
28.0-29.2
30.0-32.5
32.6-34.5
34.6-37.5
37.6-40.5
40.6-43.5
43.6-46.7
46.8-50.5
50.6-54.3
54.4-58.9
59.0-63.3
63.4-68.1
68.2-73.7
73.8-79.7
79.8-84.7
84.8-91.5
91.6-98.5
98.6-105.7
105.8-113.7
113.8-122.5
122.6-132.3
132.4-142.5
142.6-153.5
153.6-165.9
Thermal Unit
Number
CC 20.9
CC 22.8
CC 24.6
CC 26.3
CC 28.8
CC 31.0
CC 33.3
CC 36.4
CC 39.6
CC 42.7
CC 46.6
CC 50.1
CC 54.5
CC 59.4
CC 64.5
CC 68.5
CC 74.6
CC 81.5
CC 87.7
CC 94.0
CC 103
CC 112
CC 121
CC 132
166.0-180.0 CC 143
Table 133
Motor Full-load
Current (Amp)
4.60-5.23
5.24-5.86
5.87-6.25
6.26-7.09
7.10-8.25
8.26-9.49
9.50-10.3
10.4-11.2
11.3-12.5
12.6-13.8
13.9-15.0
15.1-16.9
17.0-19.1
19.2-22.0
22.1-24.4
24.5-28.0
28.1-31.8
31.9-36.0
36.1-38.5
38.6-41.2
41.3-44.4
44.5-50.3
50.4-56.9
57.0-59.0
Thermal Unit
Number
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B 14
B 15.5
B 17.5
B 19.5
B 22
B 25
B 28.0
B 32
B 36
B 40
B 45
B 50
B 56
B 62
B 70
B 79
B 88
Table 130
Motor Full-load
Current (Amp)
1.12-1.27
1.28-1.37
1.38-1.55
1.56-1.71
1.72-1.95
1.96-2.19
2.20-2.43
2.44-2.67
2.68-3.07
3.08-3.47
3.48-3.79
3.80-4.35
4.36-5.07
5.08-5.75
5.76-6.45
6.46-6.99
7.00-7.71
7.72-8.23
8.24-9.41
9.42-10.43
10.44-11.07
11.08-12.35
12.36-14.05
14.06-15.85
15.86-17.23
17.24-18.35
18.36-20.1
20.2-22.1
22.2-23.7
23.8-27.1
27.2-30.7
30.8-34.9
25.0-38.9
39.0-44.5
44.6-50.3
50.4-54.0
Table 134
Motor Full-load
Current (Amp)
4.30-4.98
4.99-5.57
5.58-5.94
5.95-6.71
6.72-7.79
7.80-8.93
8.94-9.77
9.78-10.5
10.6-11.7
11.8-13.0
13.1-14.0
14.1-15.0
15.1-17.2
17.3-19.9
20.0-22.3
22.4-26.0
26.1-29.8
29.9-34.0
34.1-36.7
36.8-39.5
39.6-42.1
42.2-46.6
46.7-51.5
51.6-54.0
Thermal Unit
Number
B 0.81
B 0.92
B 1.03
B 1.16
B 1.30
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B 14
B 15.5
B 17.5
B 19.5
B 22
B 25
B 28
B 32
B 36
B 40
B 45
Thermal Unit
Number
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B 14
B 15.5
B 17.5
B 19.5
B 22
B 25
B 28.0
B 32
B 36
B 40
B 45
B 50
B 56
B 62
B 70
B 79
B 88
© 1998 Square D All Rights Reserved
Table 131
Motor Full-load
Current (Amp)
7.88-8.91
8.92-9.95
9.96-10.57
10.58-11.95
11.96-13.79
13.80-15.85
15.86-17.43
17.44-18.55
18.56-20.5
20.6-22.9
23.0-24.7
24.8-27.9
28.0-31.7
31.8-35.9
36.0-39.9
40.0-45.7
45.8-50.9
51.0-61.7
61.8-65.1
65.2-69.9
70.0-79.5
79.6-89.4
Table 135
Motor Full-load
Current (Amp)
1 T. U. 3 T. U.
0.77-0.88
0.89-1.02
1.03-1.19
1.20-1.37
1.38-1.62
1.63-1.90
1.91-2.12
2.13-2.46
2.47-2.83
2.84-3.19
3.20-3.61
3.62-3.89
3.90-4.32
4.33-4.57
4.58-5.19
5.20-5.79
5.80-6.16
6.17-6.94
6.95-7.99
7.80-8.99
9.00-9.98
9.99-10.6
10.7-11.6
11.7-13.1
13.2-14.2
14.3-15.4
15.5-17.6
17.7-20.0
–
Thermal Unit
Number
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B 14.0
B 15.5
B 17.5
B 19.5
B 22
B 25
B 28
B 32
B 36
B 40
B 45
B 50
B 56
B 62
B 70
0.85-0.95
0.96-1.09
1.10-1.21
1.22-1.35
1.36-1.56
1.57-1.76
1.77-1.94
1.95-2.22
2.23-2.57
2.58-2.87
2.88-3.21
3.22-3.50
3.51-3.79
3.80-4.04
4.05-4.53
4.54-5.03
5.04-5.36
5.37-5.97
5.98-6.89
6.90-7.79
7.80-8.53
8.54-9.09
9.10-9.99
10.0-10.9
11.0-11.7
11.8-13.4
13.5-15.4
15.5-17.9
18.0-20.0
Thermal
Unit
Number
B 1.30
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B 14
B 15.5
B 17.5
B 19.5
B 22
B 25
B 28.0
B 32
For Type DPSG-12 & DPSG-13,
20 Ampere Starter
Select Thermal Units From
Above.
20.1-22.7
22.8-25.0
–
18.0-20.2
20.3-23.2
23.3-25.0
B 32
B 36
B 40
For Type DPSG-22 & DPSG-23,
25 Ampere Starter
Select Any Of The Thermal Units
From Above.
22.8-26.1
26.2-29.6
29.7-30.0
–
23.3-25.8
25.9-28.6
28.7-29.7
29.8-30.0
B 34
B 40
B 45
B 50
B 56
For Type DPSG-32 & DPSG-33,
30 Ampere Starter
Select Any Of The Thermal Units
From Above.
Table 132
Motor Full-load
Current (Amp)
28.0-29.9
30.0-32.5
32.6-34.5
34.6-37.5
37.6-40.5
40.6-43.5
43.6-46.7
46.8-50.5
50.6-54.3
54.4-58.9
59.0-63.3
63.4-68.1
68.2-37.7
73.8-79.7
79.8-84.7
84.8-91.5
91.6-98.5
98.6-105.7
105.8-113.7
113.8-122.5
122.6-132.3
132.4-142.5
142.6-153.5
135.6-165.9
Thermal Unit
Number
CC 20.9
CC 22.8
CC 24.6
CC 26.3
CC 28.8
CC 31.0
CC 33.3
CC 36.4
CC 39.6
CC 42.7
CC 46.6
CC 50.1
CC 54.5
CC 59.4
CC 64.3
CC 68.5
CC 74.6
CC 81.5
CC 87.7
CC 94.0
CC 103
CC 112
CC 121
CC 132
166.0-180.0 CC 143
Table 136
Motor Full-load
Current (Amp)
1 T. U. 3 T. U.
0.98-1.09
1.10-1.24
1.25-1.41
1.42-1.59
1.60-1.81
1.82-2.04
2.05-2.19
2.20-2.52
2.53-2.90
2.91-3.29
3.30-3.69
3.70-3.99
4.00-4.42
4.43-4.69
4.70-5.37
5.38-5.94
5.95-6.34
6.35-7.05
7.06-8.14
8.15-9.39
9.40-10.3
10.4-11.1
11.2-12.2
12.3-13.5
13.6-14.7
14.8-16.1
16.2-18.3
18.4-20.0
–
0.88-0.98
0.99-1.13
1.14-1.26
1.27-1.38
1.39-1.62
1.63-1.82
1.83-2.04
2.05-2.36
2.37-2.72
2.73-3.07
3.08-3.44
3.45-3.69
3.70-4.11
4.12-4.34
4.35-4.89
4.90-5.44
5.45-5.80
5.81-6.47
6.48-7.45
7.46-8.49
8.50-9.29
9.30-9.99
10.0-10.8
10.9-12.1
12.2-13.1
13.2-14.6
14.7-16.4
16.5-18.9
19.0-20.0
5/98
Thermal
Unit
Number
B 1.30
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
B 14
B 15.5
B 17.5
B 19.5
B 22
B 25
B 28.0
B 32
For Type DPSO-12 & DPSO-13,
20 Ampere Starter
Select Thermal Units From
Above.
18.4-20.9
21.0-23.6
23.7-25.0
–
–
19.0-20.9
21.0-24.1
24.2-25.0
B 28.0
B 32
B 36
B 40
For Type DPSO-22 & DPSO-23,
25 Ampere Starter
Select Any Of The Thermal Units
From Above.
23.7-27.2
27.3-30.0
–
24.2-27.2
27.3-30.0
B 36
B 40
B 45
For Type DPSO-32 & DPSO-33,
30 Ampere Starter
Select Any Of The Thermal Units
From Above.

5/98
\
Table 137
Motor Full-load
Current (Amp)
50-55.9
56-60.9
61-65.9
66-69.9
70-75.9
76-81.9
82-86.9
87-92.9
93-97.9
98-107
108-113
114-125
126-138
139-153
154-163
164-180
Table 141
Table 143
Motor FLC
(A)
Thermal Unit
Number
E 88
E 89
E 91
E 92
E 93
E 94
E 96
E 97
E 98
E 99
E 101
E 102
E 103
E 104
E 106
E 107
Thermal
Unit No.
Max. Fuse
Rating (A)
Table 138
Motor Full-load
Current (Amp)
22.6-25.5
25.6-26.4
26.5-28.9
29.0-31.9
32.0-34.5
34.6-36.9
37.0-40.6
40.7-44.0
44.1-47.4
47.5-53.1
53.2-58.3
58.4-63.5
63.6-69.9
70.0-77.1
77.2-83.3
83.4-86.9
87.0-92.9
93.0-100
Motor FLC
(A)
Thermal Unit
Number
E 62
E 65
E 66
E 67
E 69
E 70
E 71
E 72
E 73
E 74
E 76
E 77
E 78
E 79
E 80
E 96
E 97
E 98
Thermal
Unit No.
18.9-20.0 E60 40 56.4-61.0 E76 125
20.1-22.8 E61 45 61.1-64.0 E77 125
22.9-24.7 E62 50 64.1-66.0 E78 125
24.8-26.9 E65 50 66.1-72.4 E79 125
27.0-29.2 E66 60 72.5-78.2 E80 150
29.3-32.8 E67 60 78.3-83.9 E94 175
32.9-34.9 E69 70 84.0-86.0 E96 175
35.0-37.5 E70 70 86.1-92.8 E97 175
37.6-39.6 E72 80 92.9-97.9 E98 200
39.7-46.1 E73 80 98.0-105.0 E101 200
46.2-49.9 E73A 100 105.1-117.0 E102 200
50.0-56.3 E74 110 117.1-133.0 E103 200
Max. Fuse
Rating (A)
© 1998 Square D All Rights Reserved
Table 139
Motor Full-load
Current (Amp)
13.7-15.2
15.3-16.8
16.9-18.7
18.8-20.0
20.1-22.5
22.6-23.3
23.4-25.5
25.6-27.9
28.0-30.8
30.9-33.2
33.3-36.6
36.7-38.9
39.0-43.1
43.2-47.4
47.5-50.0
50.1-55.2
Thermal Unit Selection
Tables 137 thru 144
Thermal Unit
Number
E 57
E 59
E 60
E 61
E 62
E 65
E 66
E 67
E 69
E 70
E 71
E 72
E 73
E 74
E 76
E 77
55.3-60.0 E 78
Motor FLC (A) Thermal Unit No. Max. Fuse Rating (A) Motor FLC (A) Thermal Unit No. Max. Fuse Rating (A)
12.2-14.4 E56 25 43.4-46.9 E73A 90
14.5-17.8 E57 30 47.0-50.1 E74
100
17.9-18.8 E60 40 600V
Max.
Table 144
Motor
FLC (A)
Thermal
Unit No.
250V
Max.
18.9-21.4 E61 40 50.2-54.0 E76 100 110
21.5-23.0 E62 45
23.1-25.7 E65 50 54.1-58.0 E77 100 110
25.8-28.0 E66 50 58.1-60.0 E78 100 125
28.1-31.0 E67 60 60.1-67.0 E79 100 125
31.1-32.7 E69 60 67.1-70.5 E80 100 125
32.8-35.5 E70 70 70.6-75.9 E94 100 125
35.6-38.2 E71 80 76.0-82.0 E96 100 125
38.3-43.3 E73 80 82.1-86.0 E97 100 125
Table 142
Motor FLC (A) Thermal Unit No. Max. Fuse Rating (A) Motor FLC (A) Thermal Unit No. Max. Fuse Rating (A)
11.7-13.5 E56 25 40.0-43.8 E73A
90
13.6-16.7 E57 30 43.9-46.2 E74
90
16.8-18.1 E60 35 46.3-50.0 E76
100
18.2-20.0 E61 40 600V 250V
20.1-21.9 E62 40
Max. Max.
22.0-24.2 E65 45 50.1-53.9 E77 100 110
54.0-56.0 E78 100 110
24.3-26.2 E66 50 56.1-61.0 E79 100 125
26.3-29.2 E67 50 61.1-65.9 E80 100 125
29.3-32.0 E69 60 66.0-72.0 E94 100 125
32.1-34.3 E70 70 72.1-75.9 E96 100 125
34.4-36.2 E71 70 76.0-79.9 E98 100 125
36.3-39.9 E73 80 80.0-86.0 E101 100 125
Max. Fuse
Rating (A)
Table 140
Motor Full-load
Current (Amp)
0.34-0.36
0.37-0.40
0.41-0.43
0.44-0.47
0.48-0.51
0.52-0.56
0.57-0.62
0.63-0.67
0.68-0.73
0.74-0.77
0.78-0.84
0.85-0.93
0.94-1.00
1.01-1.08
1.09-1.15
1.16-1.27
1.28-1.45
1.46-1.61
1.62-1.81
1.82-2.00
2.01-2.12
2.13-2.29
2.30-2.43
2.44-2.66
2.67-2.98
2.99-3.16
3.17-3.39
3.40-3.69
3.70-4.00
4.01-4.48
4.49-5.00
5.01-5.44
5.45-5.99
6.00-6.60
6.61-6.96
6.97-7.26
7.27-7.99
8.00-8.89
8.90-9.74
9.75-10.50
10.6-11.5
11.6-12.3
12.4-13.4
13.5-15.2
15.3-17.2
17.3-18.4
18.5-20.6
20.7-21.3
21.4-23.4
23.5-24.0
Motor FLC
(A)
Thermal
Unit No.
Thermal Unit
Number
E 3
E 4
E 5
E 6
E 7
E 8
E 9
E 11
E 12
E 13
E 14
E 16
E 17
E 18
E 19
E 23
E 24
E 26
E 27
E 28
E 29
E 31
E 32
E 33
E 34
E 36
E 37
E 38
E 39
E 41
E 42
E 44
E 46
E 47
E 48
E 49
E 50
E 51
E 52
E 53
E 54
E 55
E 56
E 57
E 60
E 61
E 62
E 65
E 66
E 67
18.2-19.1 E60 40 52.7-56.0 E76 110
19.2-22.1 E61 40 56.1-58.4 E77 125
22.2-23.1 E62 45 58.5-61.9 E78 125
23.2-25.7 E65 50 62.0-67.1 E79 125
25.8-27.7 E66 50 67.2-72.3 E80 150
27.8-31.3 E67 60 72.4-75.9 E94 150
31.4-33.3 E69 70 76.0-85.6 E96 150
33.4-35.9 E70 70 85.7-91.2 E98 175
36.0-38.4 E71 80 91.3-100.0 E101 200
38.5-44.2 E73 80 100.1-108.9 E102 200
44.3-46.8 E73A 90 109.0-119.9 E103 200
46.9-52.6 E74 100 120.0-133.0 E104 200
Max. Fuse
Rating (A)
41

Thermal Unit Selection
Tables 145 thru 148
42
Table 145
Motor Full-load
Current (Amp)
1 T.U. 3 T.U.
1.00-1.11
1.12-1.27
1.28-1.36
1.37-1.53
1.54-1.78
1.79-2.02
2.03-2.20
2.21-2.52
2.53-2.94
2.95-3.30
3.31-3.70
3.71-4.02
4.03-4.46
4.47-4.69
4.70-5.37
5.38-5.94
5.95-6.34
6.35-7.09
7.10-8.46
8.47-9.32
9.33-10.2
10.3-10.9
11.0-12.1
12.2-13.4
13.5-14.2
14.3-16.0
16.1-18.1
18.2-20.5
20.6-23.5
23.6-27.2
27.3-30.8
30.9-35.0
35.1-37.2
37.3-40.0
....
0.91-1.02
1.03-1.15
1.16-1.27
1.28-1.39
1.40-1.61
1.62-1.84
1.85-2.03
2.04-2.34
2.35-2.69
2.70-3.02
3.03-3.39
3.40-3.65
3.66-4.04
4.05-4.28
4.29-4.85
4.86-5.38
5.39-5.71
5.72-6.39
6.40-7.53
7.54-8.34
8.35-9.14
9.15-9.74
9.75-10.7
10.8-11.8
11.9-12.2
12.3-14.4
14.5-16.4
16.5-18.9
19.0-21.3
21.4-23.3
23.4-27.9
28.0-31.4
31.5-32.5
32.6-36.5
36.6-40.0
Thermal
Unit
Number
B1.30
B1.45
B1.67
B1.88
B2.10
B2.40
B2.65
B3.00
B3.30
B3.70
B4.15
B4.85
B5.50
B6.25
B6.90
B7.70
B8.20
B9.10
B10.2
B11.5
B12.8
B14
B15.5
B17.5
B19.5
B22
B25
B28.0
B32
B36
B40
B45
B50
B56
B62
For Type DPSG-42 & DPSG-43,
40 Ampere Starter. Select any of
the Thermal Units from above.
Table 149
Motor Full-load
Current (Amp)
56.4-62.3
62.4-74.3
74.4-81.5
81.6-88.7
88.8-97.1
97.2-106
107-116
117-127
128-141
142-157
158-167
168-188
189-209
210-233
234-266
Table 153
Motor Full-load
Current (Amp)
14.6-15.3
15.4-16.2
16.3-18.0
18.1-19.5
19.6-21.0
21.1-23.0
23.1-24.2
24.3-26.0
26.1-27.9
28.0-29.9
30.0-32.6
32.7-34.6
34.7-36.5
36.6-40.0
Thermal Unit
Number
AR1.53
AR1.68
AR1.85
AR2.04
AR2.24
AR2.46
AR2.71
AR2.98
AR3.28
AR3.62
AR3.98
AR4.37
AR4.80
AR5.30
AR5.80
Thermal Unit
Number
CC20.9
CC22.8
CC24.6
CC26.3
CC28.8
CC31.0
CC33.3
CC36.4
CC39.6
CC42.7
CC46.6
CC50.1
CC54.5
CC59.4
Table 146
Motor Full-load
Current (Amp)
1 T.U. 3 T.U.
3.90-4.22
4.23-4.49
4.50-5.14
5.15-5.78
5.79-6.23
6.24-7.03
7.04-8.23
8.24-9.31
9.32-10.1
10.2-10.7
10.8-11.9
12.0-13.1
13.2-13.9
14.0-15.9
16.0-18.0
18.1-20.8
20.9-23.1
23.2-26.9
27.0-31.4
31.5-36.0
36.1-38.8
38.9-41.7
41.8-46.3
46.4-50.0
3.60-3.89
3.90-4.15
4.16-4.76
4.77-5.30
5.31-5.70
5.71-6.46
6.47-7.65
7.66-8.55
8.56-9.36
9.37-9.9
10.0-10.9
11.0-12.0
12.1-12.8
12.9-14.2
14.3-16.0
16.1-18.5
18.6-21.2
21.3-24.9
25.0-28.0
28.1-31.7
31.8-34.6
34.7-37.4
37.5-40.0
40.1-46.4
Thermal
Unit
Number
B5.50
B6.25
B6.90
B7.70
B8.20
B9.10
B10.2
B11.5
B12.8
B14
B15.5
B17.5
B19.5
B22
B25
B28.0
B32
B36
B40
B45
B50
B56
B62
B70
.... 46.5-50.0 B79
For Type DPSG-52 & DPSG-53,
50 Ampere Starter. Select any of
the Thermal Units from above.
Table 150
Motor Full-load
Current (Amp)
49.2-54.5
54.6-63.5
63.6-69.5
69.6-75.5
75.6-81.5
81.6-88.7
88.8-95.3
95.4-104
105-116
117-132
133-148
149-166
167-184
185-207
208-229
230-266
Thermal Unit
Number
AR1.53
AR1.68
AR1.85
AR2.04
AR2.24
AR2.46
AR2.71
AR2.98
AR3.28
AR3.62
AR3.98
AR4.37
AR4.80
AR5.30
AR5.80
AR6.40
© 1998 Square D All Rights Reserved
Table 147
Motor Full-load
Current (Amp)
1 T.U. 3 T.U.
1.04-1.14
1.15-1.29
1.30-1.43
1.44-1.56
1.57-1.79
1.80-2.03
2.04-2.26
2.27-2.51
2.52-3.03
3.04-3.31
3.32-3.73
3.74-4.07
4.08-4.49
4.50-4.76
4.77-5.44
5.45-6.04
6.05-6.46
6.47-7.24
7.25-8.64
8.65-9.59
9.60-10.5
10.6-11.3
11.4-12.6
12.7-13.9
14.0-14.9
15.0-16.5
16.6-18.9
19.0-22.2
22.3-24.6
24.7-28.6
28.7-32.4
32.5-37.3
37.4-39.5
39.6-40.0
....
0.93-1.04
1.05-1.18
1.19-1.33
1.34-1.43
1.44-1.67
1.59-1.88
1.89-2.09
2.10-2.41
2.42-2.79
2.80-3.15
3.16-3.54
3.55-3.75
3.76-4.22
4.23-4.46
4.47-5.09
5.10-5.61
5.62-5.99
6.00-6.70
6.71-8.19
8.20-8.79
8.80-9.66
9.67-10.2
10.3-11.4
11.5-12.6
12.7-13.5
13.6-15.1
15.2-17.2
17.3-19.9
20.0-22.5
22.6-26.2
26.3-29.9
30.3-34.0
34.1-36.2
36.3-38.7
38.8-40.0
Thermal
Unit
Number
B1.30
B1.45
B1.67
B1.88
B2.10
B2.40
B2.65
B3.00
B3.30
B3.70
B4.15
B4.85
B5.50
B5.25
B6.90
B7.70
B8.20
B9.10
B10.20
B11.5
B12.8
B14
B15.5
B17.5
B19.5
B22
B25
B28.0
B32
B36
B40
B45
B50
B56
B62
For Type DPSO-42 & DPSO-43,
40 Ampere Starter. Select any of
the Thermal Units from above.
Table 151
Motor Full-load
Current (Amp)
40.8-45.5
45.6-49.9
51.0-57.5
57.6-65.9
66.0-73.1
73.2-81.5
81.6-92.3
92.4-104
105-114
115-128
129-140
141-160
161-193
194-209
210-232
233-248
249-266
Thermal Unit
Number
B1.03
B1.16
B1.30
B1.45
B1.67
B1.88
B2.10
B2.40
B2.65
B3.00
B3.30
B3.70
B4.15
B4.85
B5.50
B6.25
B6.90
Table 148
Motor Full-load
Current (Amp)
1 T.U. 3 T.U.
4.14-4.45
4.46-4.88
4.89-5.44
5.45-6.08
6.09-6.42
6.43-7.28
7.29-8.42
8.43-9.64
9.65-10.4
10.5-11.2
11.3-12.3
12.4-13.7
13.8-14.8
14.9-16.5
16.6-18.7
18.8-21.4
21.5-24.3
24.4-28.0
28.1-33.3
33.4-37.6
37.7-41.1
41.2-44.1
44.2-47.8
47.9-50.0
3.70-4.09
4.10-4.35
4.36-5.07
5.08-5.79
5.80-6.27
6.28-7.16
7.17-8.58
8.59-9.55
9.56-10.2
10.3-10.9
11.0-11.9
12.0-13.1
13.2-14.0
14.1-14.8
14.9-17.0
17.1-19.6
19.7-22.1
22.2-26.0
26.1-29.4
29.5-34.0
34.1-36.4
36.5-39.2
39.3-42.4
42.5-49.3
5/98
Thermal
Unit
Number
B5.50
B6.25
B6.90
B7.70
B8.20
B9.10
B10.2
B11.5
B12.8
B14
B15.5
B17.5
B19.5
B22
B25
B28.0
B32
B36
B40
B45
B50
B56
B62
B70
.... 49.4-50.0 B79
For Type DPSO-52 & DPSO-53,
50 Ampere Starter. Select any of
the Thermal Units from above.
Table 152
Motor Full-load
Current (Amp)
14.6-15.5
15.6-16.6
16.7-18.5
18.6-20.1
20.2-21.8
21.9-23.6
23.7-25.1
25.2-27.2
27.3-29.2
29.3-31.4
31.5-33.8
33.9-36.5
36.6-39.1
39.2-42.3
Thermal Unit
Number
CC20.9
CC22.8
CC24.6
CC26.3
CC28.8
CC31.0
CC33.3
CC36.4
CC39.6
CC42.7
CC46.6
CC50.1
CC54.5
CC59.4

Square D Company
8001 Highway 64 East
Knightdale, NC 27545-9023
(919) 266-3671
INNOVA and ESP100 are registered trademarks of Furnas Electric Company.
ADVANTAGE is a registered trademark of Eaton Corporation.
MOTOR LOGIC is a trademark of Square D Company.
SERIPLEX, Square D and are registered trademarks of Square D Company.
Catalog No. 9065CT9701 May 1998 © 1998 Square D All Rights Reserved.